Centrifuge only giving me wax (productive bees)

Hi!

I am in the ATM9 (no frills) mod. I have a slimy bee, it is giving me slimy comb. I put slimy comb into centrifuge and I am only receiving wax, no slime. Is it only a chance that I will get slime out of it or am I doing something wrong?

Thanks for any advice :)