Hello dear Pi-hole community,
since updating to version 6.x, my wife has been experiencing the following issue:
Whenever she clicks on certain advertisement links in her email app (iPhone), she is no longer redirected to an empty page (as was previously the case when a domain was blocked – I used to manually whitelist such domains). Instead – and this is where it gets weird – she gets redirected to the Pi-hole admin panel. The address bar still shows the original domain she tried to visit, but with “admin/login” appended. Occasionally, she also gets redirected to Pi-hole’s 404 page.
However, in the Query Log, these domains are not listed as blocked; they appear to be forwarded normally.
So far, this issue affects only three domains, but my domestic peace is at risk. 
Pi-hole is running on a Raspberry Pi 3 with a standard configuration—only Pi-hole is installed. The Fritzbox handles DHCP. I read in the forum that the new FTL server might be responsible for this issue.
Does anyone have a solution or has encountered a similar problem?
Best regards,
Elias