Custom avatar really broken

every time I change worlds my avatar changes to another favorited avatar and walking makes my character starts to lean back. for some reason if I change the world I’m in my avatar changes to another one in my favorites, also when I walk forward my avatar starts leaning more and more back don’t know if that last one is from the warning I get saying “the angle between pelvis and thigh bones should be close to 180 degrees (this avatars angle is 0.0) you avatar may not work with full body IK and tracking” I’m more confused by why my avatar changes every time I change worlds.