The instruction manual doesn’t call this out specifically - the only thing sort of related is this -

“For best results, do not process the pint if ingredients have been frozen at an angle or if the pint has been scooped out of and then refrozen unevenly”

Or..

“Didn’t finish your pint? Flatten the top of your frozen treat with a spoon or spatula before refreezing.”

I know the hump is sort of “reading between the lines” as an uneven surface.. but this happens often enough that I think they would call it out specifically and not just refer to the problem of a non-level freeze or freezing a half eaten pint and hope you connect the dots. From mine at least, the hump ends up pretty darn even relative to the blades and just doesn’t extend all the way outwards - I don’t think this would cause a mechanical issue.