Custom webapp: 302 Found error

I have a weird error message after I upgraded a custom webapp, and I wonder if it has to do with Yunohost and its Nginx configuration or not and if it possible to fix.

I upgraded the wonderful Wikindx https://wikindx.sourceforge.io/ - a simple oldschool php mysql app and when I go to the frontpage I see

before further below I am able to see the usual front page content.

This happens only on the front page. The other pages with names as https://webapp.domain.com/index.php?action=resource do not display the 302 error.

There are no error message in the log apart from this warning

nginx: [warn] could not build optimal proxy_headers_hash, you should increase either proxy_headers_hash_max_size: 512 or proxy_headers_hash_bucket_size: 64; ignoring proxy_headers_hash_bucket_size

Any ideas? Thanks!

What version of Yunohost are you running?

Do you see any errors in:
/var/log/yunohost/yunohost-api.log
/var/log/yunohost/yunohost-cli.log
/var/log/nginx/error.log
?

Thanks for your reply. I run the latest H version. No error messages in these files. It might be no YH issue then?