Posting photos of the prey, the snake, the enclosure, and details on all the enclosure parameters might help someone see something out of order that could be contributing.
Regardless, it would be a very good idea to set up a vet visit ASAP. Sounds like there's possibly some sort of obstruction or maybe a anatomical irregularity playing a role, and it would be well worth ruling out those or any other possible medical issues.
The OP of this thread didn't post anything on this forum after this thread. That suggests that maybe things did not go well with their snake.
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