Pages are still blocked after uninstall

I've uninstalled Pi-Hole with the script, rebooted a few times but pages hosted on my pi's apache2 server are still blocked. This is the header it sends back (even if I use the ip address):

HTTP/1.1 404 Not Found
X-Pi-hole: A black hole for Internet advertisements.
Content-Type: text/html
Content-Length: 345
Date: Sun, 19 Mar 2017 21:31:13 GMT
Server: lighttpd/1.4.35

How could I figure out the problem?
Pages from other domains work well.

Is it possible, that lighttpd and apache2 are causing problems, when running parallel?

Remove lighttpd if you don't need it. It appears that the config is still being applied. The reason you are getting back those responses is because lighttpd can't find the information that you're looking for (hosted on apache).

Is it possible to run it with apache2?

yes, check here