Problem with composition - endless loading

[Sinled]

Hi,
i am trying to setup storybook composition, and have strange problems,
everything works fine on local machine, but wouldn't work on gitlab pages, each url from composition configuration is working, and can be opened separately without problems, but when i open root storybook, all composite parts are stuck in loading, without any error in console, network requests to stories.json completed.
When i run root storybook locally with urls pointing to gitlab pages - it also works.

Any ideas what might be causing this problem?