As you can see in the video, 61 fireworks stuck with my cursor. I'm not sure how it happened. what I was doing is I took 6 stacks of sugarcane and 6 stacks of gunpowder. my inventory was pretty full. maybe 2-3 slots are empty. There were 55 fireworks already in my 4th Hotbar. then I entered the crafting table and shift crafted some paper some dropped off then I crafted some fireworks and some dropped off. This went back and forth and then this happened.
Then saved and quit and re-logged and that glitchy item came back in my 4th slot.