Minecraft Username: CoolManPlayzMc Brief Description: 2 mobs stack to a 3x mob instead of a 2x mob. Instructions: Either use a spawner or find 2 mobs of the same kind, let them stack, they'll be 3x instead of 2x, it's the same for 3 or 4 mobs, they stack 1 extra. How many times did you recreate this?: Around 3 times. Result: Mobs stack to 3x. Expected Result: They stack only to 2x. Evidence:
Are you sure the spawner didn't just spawn in another polar bear? Your video doesn't show the spawners so it's hard to tell when they go off.