Potentially stupid question

Have a power bank that is mainly used by my kids for their tablets.

Have noticed a couple of times that the ports are out of alignment with the opening on the casing. I can generally guide them back into alignment.

But what is the likely cause of this, the kids obviously have denied dropping it, is there a chance it is the battery swelling?

There is no sign of swelling on the exterior case, but obviously I don’t want to take a chance on a potentially explosive outcome.