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Hello,

I ran a static optimization on the model, with a motion file to show a seated posture, external forces applied to the back to represent the forces a seat would be exerting on the human body. The actuator forces were appended by having a 1000N limit for the pelvic region.

After running the Static optimization, I noticed that the left and right internal forces of the muscles are not the same, such as the levator scapulae, I cant seem to figure out why is it happening.

I can share the files in a google drive if needed.

Thanks.

Without seeing your setup, I would suspect something is awry with your external forces (these files are, at times, tricky to make and then assign to segments). Look at the Inverse Dynamic results to confirm those are symmetric, and then go from there.
Jake Banks