I checked the crimps on some pre-made MC4 cables that I bought from Amazon years ago and not a single one was crimped properly. Most of the time the wire would just fall straight out of the crimped connector part when I un-screwed the plastic part.
NGL I think there should be a FAQ that says, the only thing you should buy from Amazon are tools. Everything else should come from a supply house or somebody unloading extras on eBay.
