Bags not staying where I put them

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This is one of my biggest annoyances...

I'm still using the default Bag UI parts, I place my bags in two vertical columns on the left of my screen. I turn off the frames and set the transparencies such that the slots are the only part that is visible.

However, every time I log in, the middle two bags line up under the top two as if the top two were only 4-slot bags. The bottom two line up correctly under the middle two however.

This is so frustrating, because I have to move the middle two down, then the bottom two down again (because they aligned propperly with the middle two, with just enough spacing).

I've tried locking them, but all that does is force me to un-lock them before I can move them.

The stupid thing is all my bank chests stay lined up where I put them, just my six inventory bags.

Would using a cutom bag UI (which I was going to do anyway) help this, or what should I do? Anyone else have this problem?