Wasn’t it just that the silver roller balls kept rolling but because the glass sphere was stuck the balls rolled the interior structure along the glass until it shorted out, locking the boys upside down? I mean, if we’re to believe the gyrosphere technology works the way it appears to in the film (and somehow they’re not looking through muddy, dino poop smeared glass the whole time for some reason,) the technology could’ve possibly caused their seats to rotate around until they were upside down...
Or maybe I’m thinking about it too much.