Apache redirect loop for website in subfolder

[acezero911]

I really hope someone can give me some pointers about what might be going wrong with my setup. Anubis runs well and I haven't had any problems with the configuration. However, I have a Moodle website which runs inside a subfolder on my domain. Prior to Anubis it was working fine, but now I have a redirect loop that does not end.

The website was always available at https://www.cenasuportaal.org/opleiding
When checking redirects the following behavior is observed until the redirect limit is reached.

https://www.cenasuportaal.org/opleiding 301 Moved Permanently
http://www.cenasuportaal.org/opleiding/ 301 Moved Permanently
https://www.cenasuportaal.org/opleiding/ 303 See Other
https://www.cenasuportaal.org/opleiding 301 Moved Permanently
http://www.cenasuportaal.org/opleiding/ 301 Moved Permanently
https://www.cenasuportaal.org/opleiding/ 303 See Other

Any help would be greatly appreciated.