At least one of your problems involves your atlas bleeding.
The first half of this first post might be useful for you: viewtopic.php?t=3132
For some reason, the default Sprite shader is causing your character to blend additively. That's weird.
(1) Did you pack the texture using Spine? Or did you use an external program? Did you change some settings there or did you leave it default?
(2) Were your assets auto-processed by Spine-Unity? Were you using the latest Spine-Unity runtime? Are you using TK2D?
(3) Did you change any of the texture settings after you imported your assets? (particularly for the atlas texture/png file)