as a mix of “shatter & crumble” there may have been more terpenes than usual, or there may have been more water… either way, evaporating those off happens at the expense of energy that would go to decarboxylation. which could slow your decarb down. especially when using still air as your heat transfer medium (convection ovens work great).
if it is behaving as you expect, and you trust your buddy not to sell you Fake concentrate? - #14 by stoopkid then you’re in good shape. there is a bunch of product out there that has been adulterated with pine resin and other nonsense