My guess is this is a “recursive internal link issue” within theme code.
Might be an easy fix from support or the theme seller, so worth a try there as a first port of call.
But sometimes these issues can be difficult to pinpoint. There are a few tricks but better suited for a developer or tech SEO.
Process would be roughly:
- Find problem
Using things like Chrome devtools, theme editor, ScreamingFrog etc - Tweak theme code in Shopify admin theme editor
- Test the fix looks like it’s working.
- Wait days to weeks for Search Console to stop discovering and eventually forget these URLs