A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Dvir,
Thanks for writing back and sharing the updates.
As per the updates, I suggest you remove the user completely from the site and re-add the user to check the outcome:
Open the Site> Settings> Site Permissions> Advanced Permission Settings> Click on the member's group> In the URL, change 7 to 0 and click on enter> In the People and Groups page, check the problematic user and click on the Actions> Delete the User from the Site Collection> Reshare and ask the user to access the list from the InPrivate browser.
If this suggestion helps, please click on the helpful button as this will help other members of this community with related scenario.
Best Regards,