I've positioned some entities in the scene using the HE (version 3.2.0, I believe). If I repeatedly select the *same* database in the upper-right drop-down, the entities will jump to a new lat/lon. If I continue selecting the same database, the entities will jump back and forth between where I placed them and some other lat/lon.
Sometimes the jump is as large as a geocell. Other times it is only a few dozen meters.
I confirmed that the HE is sending bogus entity locations with the HE's logging feature; this is not a bug in the MPV.