As Bill said, the shoes are most likely out of adjustment. . The other possibility is that the drums are worn way over-size(not too likely but possible)or you have the wrong shoes. . Try adjusting them first
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us. - - Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!