Crit'air problem....

Has anyone had an issue with being issued an incorrect Crit'air classification?

Their website clearly shows my MH as a class 2 and i completed the application just assuming that's what they'd send me. Today i get the email showing that I've been classified as a 4 - on a 2021 Euro 6 vehicle !

Obviously I've emailed them and hope they understand and correct it, but wondered if anyone else had come across the same problem?

Thanks !