Pihole admin index page is loading forever

##Problem:
Everything seems to be working correctly and it's all updated, but my admin page won't stop spinning and it doesn't show me any details about queries and what are being blocked. It simply stopped after i left for a weekend and I can't get it back to what it's supposed to be. I've tried updating and deleting and reinstalling and no luck, any tips?
I think I am getting more ads than before even though it says it's working.

Debug Token:

https://tricorder.pi-hole.net/k36xk9h985

Any helps is greatly appreciated!

From your debug log most things seem to work, only a few are a bit suspicious/uncommon:

There is not DHCP server on your network?

*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
   Scanning all your interfaces for DHCP servers
   Timeout: 10 seconds
   
   DHCP packets received on interface wlan0: 0
   DHCP packets received on interface lo: 0

There are a few restarts of the web server (lighttpd). Did you manually restart it?

   2021-02-22 09:31:35: (server.c.1464) server started (lighttpd/1.4.53) 
   2021-02-22 09:36:33: (server.c.2059) server stopped by UID = 0 PID = 1 
   2021-02-22 09:36:35: (server.c.1464) server started (lighttpd/1.4.53) 
   2021-02-23 07:49:06: (server.c.2059) server stopped by UID = 0 PID = 1 
   2021-02-23 07:49:07: (server.c.1464) server started (lighttpd/1.4.53) 
   2021-02-23 07:45:45: (server.c.1464) server started (lighttpd/1.4.53) 

Pi-hole is/has been working

   [2021-02-23 08:03:54.951 890M]  -> Total DNS queries: 1322
   [2021-02-23 08:03:54.952 890M]  -> Cached DNS queries: 293
   [2021-02-23 08:03:54.952 890M]  -> Forwarded DNS queries: 926
   [2021-02-23 08:03:54.952 890M]  -> Blocked DNS queries: 98
   [2021-02-23 08:03:54.952 890M]  -> Unknown DNS queries: 1
   [2021-02-23 08:03:54.952 890M]  -> Unique domains: 471
   [2021-02-23 08:03:54.953 890M]  -> Unique clients: 14
   [2021-02-23 08:03:54.953 890M]  -> Known forward destinations: 4

One of your upstream DNS server is refusing some requests. Might be worth considering picking another upstream server

   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.220.220
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.222.222
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.220.220
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.222.222
   Feb 23 07:56:25 dnsmasq[15129]: reply error is REFUSED
   Feb 23 07:56:25 dnsmasq[15129]: query[type=65] star.c10r.facebook.com from 192.168.0.150
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.220.220
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.222.222
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.220.220
   Feb 23 07:56:25 dnsmasq[15129]: forwarded star.c10r.facebook.com to 208.67.222.222
   Feb 23 07:56:25 dnsmasq[15129]: reply error is REFUSED
   Feb 23 07:56:28 dnsmasq[15129]: query[type=65] me.apple-dns.net from 192.168.0.157
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.220.220
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.222.222
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.220.220
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.222.222
   Feb 23 07:56:28 dnsmasq[15129]: query[AAAA] me.apple-dns.net from 192.168.0.157
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.220.220
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.222.222
   Feb 23 07:56:28 dnsmasq[15129]: forwarded me.apple-dns.net to 208.67.220.220

Regarding the non-working index:
Did you try to clear your browser's cache? Have you tried with different browsers? Are there any errors shown? Do you have any browser plugins installed?

  1. I do have a DHCP on my router running with a static address for the pi.
  2. I did manually restart a few times trying to get something to work.
  3. It looks like something is working but weird I can't see it and I seem to be getting more ads.
  4. How can I pick another upstream server to change it? I didn't see this part.

INDEX:
I did clear my browsers cache, I tried on Chrome, Firefox, and Safari, No errors are shown it just loads forever but my settings and all other pages work, on incognito and other browsers it still just doesn't show up.
Thanks for the thorough reply, I've been pretty confused trying to troubleshoot and appreciate all the help.
Let me know if you have any other suggestions.

It seems like I'm getting a lot of errors with an undefined variable in the error.log file, Do you think it could have something to do with that?

2021-02-23 08:04:45: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 08:04:45: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 08:04:45: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 08:04:45: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 08:18:26: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 08:18:26: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 19:48:56: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 19:48:56: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 19:48:56: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 19:48:56: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 19:52:32: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 19:52:32: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74
   2021-02-23 19:52:32: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: viewPort in /var/www/html/pihole/index.php on line 73
   2021-02-23 19:52:32: (mod_fastcgi.c.421) FastCGI-stderr: PHP Notice:  Undefined variable: serverName in /var/www/html/pihole/index.php on line 74

Those happen when you run pihole -d so if you've done the debug a few times then you can ignore that.

Try opening the development tools of chrome and see if there are any errors while loading the site