URI wrong hostname/hostname/search instead of hostname/search

[hivefi]

I installed searx according to the instructions here: https://github.com/searx/searx-docker

First it worked but now it gets the base URI wrong. It gives hostname/hostname/seach instead of hostname/search.

I tried to configure ddclient for use with a dyndns provider. Therefore I changed the base Url in settings.yml and .env. But I changed it back to the actual URI after that did not work. Also, I uninstalled ddclient.

What can be the reason for the correct URI not being recognized and how to resolve this?

[hivefi]

performed reinstall.