hello to all im going to try to explain whats happens when i activate the "snap to grid"
First the "snap to grid' is wrong for me, because the objects who need to be snap, need to be snap INSIDE the grids, and not on the corners of the grid, this is really really problematic for precision work.
Second, make5 littles cubes with different colors one the center (bigger) and the 4 others do it smallers, and put each one in a different side (like a cross shape).
and NOW select all thoses littles cubes "COPY" your selection, and try to paste that with the snap to grid activated.....the objects are in complete disorder, its impossible to keep the same shape like the first selection.
here you can see at the left side the original object, and on the right side, the differents copies, its all wrong...