Mirrored bones are different sizes?

I’m trying to do a mirrored bone extrude using shift+e and the bones that are extruded end up being different sizes. I’m pretty sure that’s not normal. Anyone know if this is a problem and if so, how to fix it?

You asked your question in the wrong section. Try asking it in Rigging thread. Also, try rigging one side of the model and then mirror it to the other side when it is done.