I have one or two bags I open and close from time to time, but mostly I keep them ‘collapsed’ state in my inventory.
Recently, a bag that I open, then close, will keep flipping back to open every time I zone to a near area, at which point I have to close it again. It seems to eventually stabilize back to it’s collapsed state across zones, but open it just once to take a look at some things, and I have to ‘fight the good fight’ to get it back to collapsed.
Annoying.