Most likely it is too late for you but maybe this will help someone else as I was struggling with the similar problem. This happens because sometimes 3dsmax can't recognize which is the mirror bone so it picks the same one or a wrong one. In mirror mode you can see blue, green and red bones and red ones are those who…
Quick introduction: Hello, it's long past due that I sign up to Polycount, but a problem I'm having has made me finally do it and I know no place like Autodesk forums or something will solve my problem. Anyway, I'm trying to create a set of first person arms and not having too much rigging experience I've ran into a…