Hmmm. (That worked thanks.)
Oh, on the screen shot it looks like the left arm has “left wrist” tag on the shoulder as well as the wrist - they might confuse it.
What are the behaviors added to the arms? I notice they have been added, but not sure what.
If you want me to have a look, feel free to export the puppet (using Export Puppet in the menus) and share that - either a DM to just me, or here in the forums. I think you have things basically correct - its just some little tagging or behavior issue I am sure.