From what I've read on YT humping really has very little to do with reproductive matters. Humping is a way of showing dominance. My room mate has a neutered pom and he humps boy and girl dogs alike. He was never a stud (he was a rescue, so this info is as far as we know) yet he likes to hump. I guess I'm trying to say, yes humping is normal.
I don't know if this info helps you at all.
__________________ Littlest JakJak 
We miss you Kaji 
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