Mass of ship not always updating
I kept adding the same block and it does not always add the same mass. i.e. it does not always calculate and show the correct mass on the HUD and on the control panel. Sometimes it doesn't add anything and sometimes it adds the wrong amount. It was even weirder when adding thrusters as it would more often stay the same multiple times and then suddenly calculate correctly after adding a few.
I tested 1.5m cargo containers on 2 different ships, each with single grids, by adding the 1.5m cargo one at a time and checking the mass indicated on the HUD and control panel. It's usually around whenever I get to 5, 15, or 25 that it screws up but then after adding a few more it generally fixes itself and shows the expected mass.
The attached record was done in creative mode tested just outside Vallis Reach on Verdure. I also did it unrecorded in space.
I have the same bug 
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