Proxy Issue with Track Rig

Hello Blender Artists, I don’t know if I’ve actually posted yet, I haven’t had a real reason to. Well now I’m here to sponge knowledge from the community.

I’ve got this problem with my tank track rig, it works fine in the original blend file but when I add it into my animation scene and make it a proxy, well, see for yourself: (3.15MB):

Has anyone got any idea why that might be happening? It’s not the end of the world if I can’t figure it out in time but I would like to have it sorted for future projects.

Thanks for your time.