How to reproduce:
1. Open attached project
2. Select all 4 planes
3. Drag the objects a big distance on one x axis
4. Inspect how the planes are now not alligned (in some cases there is a gap, in some planes overlap)

Expected behaviour: Moving a group of objects moves all of them the same distance
Actual behaviour: Due to floating point inprecision the objects are not moved the same distance

Reproduced on: 5.5.0f1, 5.5.3p3, 5.6.0f3, 5.6.0p3, 2017.1.0b4

Fixed in: 2017.2.0b1
Backported to: 2017.1.0f1, 5.6.2p1, 5.5.4p2