Why do [B&M Inverts] seem to make people vomit??

Gross question I know, but I figured I'd finally ask. I've never gotten nauseous on any coaster, but I can theoretically understand for things like spinners. But for some reason the model that seems to be the most vomit-soaked (in my experience) is the B&M Invert... I've seen so many folks lose their lunch on these! It's the only model where somebody actually barfed on me! And I can't figure out why? Nothing about them seems like a traditional dizziness trigger the way spinners are. Does having the track above somehow make it disorienting?