Different smell?

Didn't know how to search for this and it's my first grow so my bad if this has been talked about before. So from weeks 5-8 of flowering my plants smelled like dank amazingness. I harvested them a few days ago and now they smell like a cross between freshly mowed grass and that shit that smells like onions that grows in the yard. Did I fuck something up here or is this normal? They look the same now since I first did the harvest so I don't think anything has gone wrong since the harvest, mold and the likes. I vaguely remember reading that if you dry something to fast it'll taste like grass/hay but that's not the case, haven't smoked any of it yet obviously. Anyways, any ideas as to why this may be?

Ya, I flushed about a week or so before I harvested. Hopefully thats the case Grizz, thanks dudes.