Diarrhea should not occur from high humidity especially for such a short period. Diarrhea can be caused by a number of different ailments but it can also be just a once in a while random occurrence. Just keep an eye on the snake to make sure there is no appearance of dehydration (loose skin, indented eyes) and wait until his next stool passes. If the next stool is the same, take a sample to a herp vet for a fecal float/smear to examine for parasites or other abnormalities.
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