I had almost the same thing happen. My first clutch this year came out around day 53. Second clutch went to around 58. I've got a clutch of 11 that one has emerged,but the rest are still in the egg and it is day 62. The best advice I can give you is to wait and watch. Ball Pythons do not have a satellite updated internal clock that breaks them out of the egg on day 60. Some come early, some late.