Saving layer orders sometimes does not work

When I reorder some layers, ForeUI sometimes forgets the order when I click one of the layers (e.g. to move it a bit). Example:

– Layer 1 is above Layer 2

– I reorder Layer 2 below Layer 1

– I click and move Layer 2 a little bit

->> Layer 1 is again above Layer 2, but should still be below Layer 2