Can't get them to work in my RB5 shocks!

I changed pistons, oil and o-rings today. But when I got them together they felt like shit. Super rebound, both when you push them together but even more when you pull them out again. Lets say almost 1/3 rebounds back in to the shock again

Tried to switch back to the standard piston, but samesame. Tried to switch to the oi # I had before, samesame. Tried to switch back to standard o-ring, perfekt! Isn't it weird?
Sorry if the english is bad, I äm fröm Sweden