painting weights messes up previous painted joints
 

Hi people,

Using Maya since 2011 but just recently got into rigging.
I need to rig a simple packaging box and I'm using the Skin Paint Weight feature on Maya but every time that I paint a joint's weight, if I go ahead and check the previous one back, it gets completely different and messed up. I'm painting each joint again and again with zero results

I tried to lock each joint that doesn't need to be painted, as well as reducing the max influences. Nothing has worked out so far :(
Does anybody have any suggestion on why this is happening?

Thanks a lot in advance!

I just joined this site. Did you ever figure out what the issue was?
I figure you need to set the painting to "add" as it's probably on "replace".