Im having this kind of issue from the last year, in my case the users complete the form via a smartphone with android, so a link sended via whatsapp is opened via the default web browser installed (normally its chrome), the forms are submitted and enter to my board with ME as the creator when this is not real.
What i have searched and found is that (in my use case) our users doesnt have logged in Monday.com via chrome web browser, because they are working directly via the Monday.com android native App.
So, as users are not logged in monday.com on the same browser that its used to fill and send the forms, this forms returns without real user info, because they cant be retrieved, so it puts me as the creator.
Thats why i was asking from what platform users are uploading forms, because if the platform are not the same where monday.com user are logged in, then there is no way to get that info.
There is a previous feature request on: