I've seen there were 2 post with this same problem however i feel my problem varies enough for its own. I recently had a problem when i decided to buy 80k soda cans because i had nothing else to do with my units. This later caused my inventory to be accessible with white squares instead of normal items.
The problem of the soda cans stacking was fixed when i last checked when items with big numbers now stack.
However the problem of the game giving contradictory information of my units by saying on the title screen its 0 instead of 13k, and saying that i have no items is still present, as im unable to to access any of my condo's that i bought, any of my items, unable to spawn any of the items i have in the default condo (due to the white squares).