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All bones are part of one armature, both arms are one object as well. I did automatic weight thing and the mesh on the right arm acts as it should, but one on the left does that weird thing as you can see. Am i doing something wrong or?

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Fist thing, the scale is -1 on the X axis, so apply the scale of your object:

enter image description here

Once done, you need to check the normals, enable Face Orientation in the Viewport Overlays panel:

enter image description here

Blue show face normal orientation, red the opposite, as you can see the normals are flipped outside on the right arm. To recalculate the normals, go in Edit mode, select all and press AltN:

enter image description here

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  • $\begingroup$ Oh i see, how do i exactly recalculate normals if you dont mind explaining, im pretty new to rigging and animationg so im not so sure how to do it since i never had a need for it? $\endgroup$
    – Tocak
    Oct 12 '20 at 11:52
  • $\begingroup$ Never mind, i managed to do it. Thank you. $\endgroup$
    – Tocak
    Oct 12 '20 at 11:57
  • $\begingroup$ I've edited my answer, I hope it helps $\endgroup$
    – moonboots
    Oct 12 '20 at 11:57
  • $\begingroup$ Yea i figured it out, thanks for the help man. $\endgroup$
    – Tocak
    Oct 12 '20 at 11:59

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