DE10875 is a duplicate (it was filed for a similar issue but had less data).
There's not much documented about the location mechanisms. Ultimately, there's 2 different location mechanisms at work in VRF.
The AP Location mechanism relies on AP to AP data only. If the location is off by 1 meter, then the AP will be lit red if the AP location feature is enabled.
Client Location starts with AP placement, then uses signal strength and AP neighbor data to pinpoint the clients.