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This yellow symbol appeared when i pressed the link mesh button.
when i then try moving to a different skin the mesh is all messed up.
Has anyone encountered this before?

Hi Shachar Tzin! That yellow icon is there to warn you: Skins - Spine User Guide: Skin bones

If a bone/attachment/constraint not in a skin is parented to a skin bone, the bone may only be active when the skin bone is active, causing a warning icon to display next to the bone name in the hierarchy.

The mesh will look messed up because suddenly the vertices that were bound to a bone have the bone missing, but just add the bone in the correct skin to restore it.

2 years later

yeah thanks Erika!
I've just seen the same thing and got worried, maybe a hover over tooltip or some way of seeing the warning description might help in the future?