Try unchecking "Hide and remove all unowned costume parts"
That was what fixed a similar issue with me.
The Feline head is the default that is automatically applied when you switch to beast heads, so if that option is checked, and you use a head you don't have access to, it will remove the part and reset it to feline.
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That was what fixed a similar issue with me.
The Feline head is the default that is automatically applied when you switch to beast heads, so if that option is checked, and you use a head you don't have access to, it will remove the part and reset it to feline.