Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Definitely a mystery! Could you try growing the pumpkins in a totally different area the next time and see if that makes a difference? Really frustrating to having things like that happen for no apparent reason...
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion