Hello @AbdurRahmanSnow -

I would suggest do check ACL which is allowing that user with that role over record you found he is able to read, it might be some ACL is allowing user with that role to read it. Try to use Access Analyzer feature.

For Ui Action check what is condition set for visibility. I doubt since user is getting read/write access so he able to view and perform operation over same.

Or another thing you can have a look is there change on snc_internal role is there any additional role has been added to it which might be allowing access to record you showcase.

I tried to check same over OOTB PDI and if user is having only snc_internal then user can only view/write on his ticket raise by him or for him.

If my response has helped you hit helpful button and if your concern is solved do mark my response as correct.

Thanks & Regards
Viraj Hudlikar.