Reusable filter works but not the pods?

I find numerous scenarios of the reusable filter overflowing, but that is not my issue. My reusable filter works just fine; however, the actual K-Pods don't. I put a K-Pod in the keurig to brew but all it did was spill water over the top of the pod and onto the kitchen counter. When I opened the keurig it did show the needle hole where it did penetrate the top of the cup but the water didn't brew the coffee. The water just flowed over it instead of into it like it would with the reusable filter. So why will it brew with a reusable filter but not the K-Pods?