If I put a Pumkin on my head by taking it and dropping on the helmet slot,
i can only wear One!

But If I put it on my head by shift-rightclick, I can wear 1 up to 64!

Its a little Bug I randomly found!

PS.: - its my second report because the first was in german

• I'm really sorry about my maybe bad english, because I'm from
  Germany

I hope I could help!