I’m not sure that I understand the problem. Can you please provide exact steps to reproduce the problem, as described in [READ BEFORE POSTING] What’s required to diagnose a problem?
I guess it’s related to the fact that there’s a structured address and a formatted address (label); probably only one of them was edited but the other one was displayed on your Android device. Maybe this problem? https://github.com/nextcloud/contacts/issues/42brjhaverkamp created this issue in nextcloud/contacts closed Support X-ABLabel and ITEM2.xxx properties #42