Did you order a belly bar with a figurine at the bottom and is the belly bar itself not interchangeable? Then the bar is glued instead of screwed into the figurine. This is designed to protect the skin around your belly from tearing open when the figurine might stick to any clothing. Instead of ripping it open, the bar will come loose.
The same goes for dangling belly bars. There is a small ring between the lower ball and the dangle itself. This ring will snap once there is too much pressure on it.
When wearing such belly piercings, avoid clothing like wool. This will lower the risk that your belly figurine or dangle gets stuck. Wear smooth basic balls in combination with clothing like wool instead.
Because of the information above, the warranty for snapped rings and broken bars is limited to 4 weeks after the dispatch date of your order.