Why don't my character models change in state of decay.... help!?!?!

so I just downloaded diamond which is amazing! But whilst going through and mucking around with everything I noticed that I couldn’t manually change anybody’s skin and whenever I try to change my character model it goes into my save and they are in a totally random skin… I JUST WANT SHARK HOODIE GUY :cry: anyway you guys got any suggestions on what i might be doing wrong. i’m new to modding so treat me like a baby with this stuff

Thank You