Hello,
this is still an issue in v1.2 - in my case a PC version.
If you load your saved game and visit a stash while doing nothing, so all tooltip stats are displayed as 0 in stash - let's call is [FRESH STATE] - a state of just loaded game without moving items between stash and backpack - which tooltips displays all zeroes.
When you are in [FRESH STATE],
and get an item#A from the stash to the backpack,
then you put back the item#A from the backpack to the stash,
so its tooltip is being properly displayed.
The tooltip for this specific item#A remains properly displayed even if you close a stash, do something around (and not loading your saved game) and then look back into you stash,
but only tooltip for item#A is correct after such actions, another item's#B tooltip still displays 0.