It seems that I'm only getting one line of the inventory to pop up when I click on the inventory item on the bottom left. This means that past the number of objects that fit onto one line of the inventory, any further items I pick up cannot be seen or used. I do see the corners of a couple of the yellow boxes on the line below, and they stay there in a glitchy way even after I close the inventory. So it seems that the inventory menu is just generally glitching out.