While the other chests (http://prntscr.com/2zo1wj, http://prntscr.com/2zo2fv) have "Alchemical Chest" and "Inventory" written, the large one doesn't (http://prntscr.com/2zo2p0).

Not a bug. The size of the GUI limits how much room there is for for text, and since this is a HUGE inventory there isn't enough space for text to go.