Marsyian I'm sorry to hear you're having trouble. Unfortunately, this is not enough information to tell us what is causing the problem, so can you please provide the script you are using to change the skin and some screenshots to confirm the problem?

@Marsyian Also please be sure to check out the documentation pages about how to set skins:
https://zh.esotericsoftware.com/spine-unity#%E8%AE%BE%E7%BD%AE%E7%9A%AE%E8%82%A4
And the Spine Runtimes API:
http://zh.esotericsoftware.com/spine-api-reference#Skeleton-setSkin

@Marsyian No need to delete the thread. In general old postings might help others when searching for solutions to similar issues.