Maya Mirroring Muscle Weights Issue
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Hello there my good guys,
I have been looking into Maya Muscle System and all went so and so. Difficult thing to learn for me but im getting there.
What im trying to do now that doesnt work in any way, after 3 days of trying and researching is Mirroring Muscle Weights.
Say i have mirrored the musle (femur muscle from Left to right) but now i need to mirror the Muscle Weights from Left to Right, like so:

to

So i go Deform->Muscle->Weighting->Mirror Weights


"Mus_L_LegUpper" is the name of the muscle im trying to mirror to "Mus_R_LegUpper"
And indeed it does Mirror the Muscle Weight, like seen in the picture here:

Its and exact mirror. But then the issue starts here. Not only did it mirror the muscle weight (which is good) but it mirror the joint weights for some strange reason that i dont understand.
Like here (check the selected joint from "Muscle Builder"):


And these are the joint weights from right side, which are empty:


(Check the selected joint from the "Muscle Builder").
And so on for Forearm, for Calf and for every bone. And this is the effect of these switched weights if i try to move the left arm:

All im trying to do is mirror the MUSCLE WEIGHTS only from femur muscle from left to right:
---->

Which is if i do the procedure:

It will copy the muscle weight:

But it will screw my other joint weights as explained above for a strange reason, even though i search and replace the names of the muscles.
If anyone can give help i would greatly appreciate it, there no info on this issue online i have tried to search for several days.
Thanks a bunch.