Shift click does not always moves items in the desired place

What happens:
I shift click a stack of items in the hotbar while having a chest open
it moves the stack in my inventory.

if i shift click a stack in my inventory it moves it in the hotbar.

what i expected to happen:
with an open chest shift clicking anything in my inventory/hotbar moves instant in the chest.

this does not always happen. i try to reproduce it more often and will change the desciption in here afterwards.

still dont know why this happens. but i found another misbehaviour.
If the "from hotbar shiftclicking into chest" works, it also stacks up random slots in the inventory.
For example:
64 in hotbar
50 in inventory

i shift click my 64 in the hotbar. it first stacks up the 50 to 64 in the inventory and moves the rest (50) in the chest.