Contacts revert back

I try to reorganise my contacts into different groups but they keep reverting back. I can’t find in my phones settings where to fix this. Please help. This app is useless if I can’t arrange the contacts into groups.

It sounds like this might be an issue with the way groups are stored in your phone / iCloud / Microsoft Exchange container.

The app tries to store the contact-gdoup associations inside itself. So it is strange that the associations disappear.

Can you share your UDID?