Possible causes for regurgitation 10min after eating

Last night I fed 2 of my smaller snakes their usual small weaned rats, after they ate they returned to their hides and about 10min later I heard a lot of movement and the male was wriggling about quite a bit, then I noticed he was regurgitating, a few minutes later the female done the same.

This is the first time I've ever experienced this and I've been keeping for just over 5yrs.

Temps are all fine, they aren't new additions either, the rats (f/t) were bought the previous day from the same place I've bought all my rodents from for over 2yrs, they were defrosted and heated in the same way I've always done, there was no unusual smell from the rodents either.

So i was wondering what would you suspect could be the cause?


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