User log in creates new profile instead of merge


I am seeing an issue where new logins for a specific user do not seem to correctly merge. This is on a test account where the user frequently logs in on a number of devices. Up until last thursday everything was working fine, but since then it seems a new installation of the app and subsequent log in on this account creates a new profile which does not have any of the data that we send up for the user profile.

Any ideas what’s happening here?

Thanks, Merry