There is something wrong with tags synchronization between the Desktop app and the iOS app.
Unfortunately, I can’t provide many details.
I just had situations when the tag was deleted in the Desktop app but stayed in the iOS app and vice versa.
When I use the “:w” parameter to create waiting for the task, sometimes I got a new tag with the same name as the existing one. It happens with one particular contact tag and I think it is because some of my tags were created in the iOS app and others in the Desktop app.
Maybe there is a way to check how they sync and find the issue.