UNDO buffer not deep enough
I sold a group of various items to a base and one of them was a GMisD which had been clicked on by mistake when a PROM decayed (Another big problem of shifting lines on item decay that happens off screen). I could only recover 5 of the 15-20 items sold because some of the items were multiples like 30 workers.
BTW SS FUCKED me out of this and the admins would return it.