Can you send us your skel.bytes file?
unity@esotericsoftware.com
Tried loading it. I think you may have warnings disabled in your console.
It logged this:
Skeleton '######.skel' (exported with Spine 3.7.14-beta) may be incompatible with your runtime version: spine-unity v3.6
Note that binary exports are not compatible across Spine runtime versions.
If you are working on a project, you need to stay on the version of the Spine editor that matches your runtime.
Json exports are more robust across different versions, but binary export isn't.