SharePoint List - item visible but clicking on it does not open it in popup (similar to edit screen)

-this is a sharepoint online site (which gets created when we make ms teams channel)

-there is mutliple list and libraries inside this sharepoint site

-there is a list lets call that 'abc' list - it has approx 15 -20 columns- text, number, url, lookup , (nothing fancy, content types not there, just imagine a business user setup this list to put in some process relatged info..they are NOT sp advanced user )

-there are around 15 list items (yes very less items!)

-approx 3-4 days ago he created those items in the list and when he click on the item (by clicking on title) it used to open in the default sharepoint pop up

- this list has not more than 30 users with some has full control, some has read, some has edit-- mostly these permission are coming from sharpoint inherited groups , and list is still inheriting permission (active useres who contribute and view content in this list are just 3-4 people)

-now the PROBLEM is when he click on the title to view items , nothing happens , no popup opens

---fixes we tried--

• restart laptop
• -swithch browsers (tried on chrome and edge)
• currently using edge.
• removed this user from sharepoint site (he was residing in multiple groups), we removed him from every grp and deleted few grps as well
• now when we 'check' in the sharepoint permission-> it showed this user has 'none' permission
• then we granted him 'full control' again he was able to see items but cannot 'open' item, or 'add' is also not working for him
• he is however able to do 'quick edit' and enter new values
• we did hard refresh etc.
• we checked the default forms in list settings> form settings- it is default to sharepoint form (NOT power apps)
• we did other due deligence, but nothing seems to work for handful of people, however for other set of people the list is working as expected