Migration from zoho.eu to zoho.com

Migration from zoho.eu to zoho.com

Hi, I hired a developer to create an app in creator, and it worked perfectly but I needed Zapier integration, which is not available on Zoho.eu, so I migrated to zoho.com and imported the app.  However the app is acting up whereas before it was fine.  The issue is an autonumbering system that is now listing as "NULL" when before it was working fine.

Anyone know what the issue could be.  Zohosupport sucks crap, I had to migrate everything myself, took them 3 days to NOT DO anything about it, and I´m not a developer I had to google the crap out of every step :(  Would really appreciate anyone´s input.