Symptom:
On Prime Infrastructure 2.0 and 2.1, you might see APs at a wrong location when clicking on "position APs" or add new APs.
The APs still show the correct horizontal/vertical x,y position but they are displayed somewhere else. If you save without touching the APs, they keep their correct positions. If you move them, the X,y then gets updated so it's only the original location on screen in the map editor that is shown wrong. Db values are still correct.

Conditions:
Exact trigger still unknown