i just recently got thunder erubus and i enjoy it heavily, but i have one issue with it. for some reason everytime i try to twist the backpack around for the core bot robot mode it pops off. it’s broken as everytime i can just add it back and it sticks. it’s just that everytime i turn it it falls off. i try to use the screw that’s attached to it to tighten the connection but it looks like the screw just doesn’t fit? any help for this would be great, thank you!