Raw Sessions and Room Positions aren't really synced

We have performed the following experiment with 2 screens:
* on one screen, the "latest subject positions" widget
* on the second screen, the "raw sessions" vs "processed sessions" widget

I have noticed that the "latest subject positions" and the "raw sessions" don't look the same at all (!!!) so we cannot expect the fusion part to work correctly since the input data is garbage.