Hi Kellybishop,
I agree with the rest that the stones could potentially cause an impaction. It is advised to have them removed, to prevent any future accidents.
However, based on the photo alone, I don't particularly suspect anything amiss. The rounded belly could mean anything from a matured female axie, to a particularly pudgey axie. Axies with impaction would tend to be rather ill and present with other clinical signs like going off food, floating and such.
Cheers.