Floor manager units changing when changes applied

I'm struggling with a file in OpenBuildings (update 5),  

The issue I'm having is with the floor manager tool, the floor heights that we have created are in MM and working fine (until yesterday). An update was required to one of the levels, I carried out this change but when I applied the changes the decimal point has moved 3 places to the left.

Any idea why this issue would have occurred? The only thing I can think of is the design models scale was 1:100.. 

Any guidance appreciated.