127 views on a website dedicated to Maya and no answer !
I figured it out by myself : soft selection. In 3DSMax it works differently, that's why the solution to this issue wasn't obvious at first. In Maya, if "soft" is marked ON, it can influence any geometry around. Hence the problem.
Thanks Stwert for having at least tried to think about it
Last edited by hansolocambo; 21-08-2016 at 12:31 PM.