Short answer is too much movement after a meal. Otherwise, we need to know your husbandry numbers ie, warm side and cool side temperatures as well as the ambient temp. Humidity percentage. These are a couple things that, if not optimal, can cause a regurgitation in snakes. How are you measuring these is important as well and your method of heating the enclosure. Also, vomiting usually occurs within minutes or hours of a meal. Regurgitation is a different sign and occurs typically days after a meal and the meal is partially digested. What size prey did you offer him? Too large of a meal is also causative.
Stay in peace and not pieces.
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