AdobeReader is continously prefilling pdf fields and is unable to clear

Hi, We have a small team that is using Adobe Reader to open pdf from OneDrive on a Tab S2.

All these users share the same Samsung account but sync is disabled.

For some reason the PDF is getting filled in with data filled by other staff.

I have deleted  the app, deleted any cache or app data via Settings -> App

The data still comes back.

All team members save the original file to each others separate Onedrive folder.

I don't know where else does Adobe Reader requires data to be purge for this to go away.

What is causing the prefilled data to populate all team members pdf document?