My fission reactor will not respond to control rod!

[bignose956]

I was on a Voltz server setting up a fission reactor so I could power my base. But I left the reactor with the breeder fuel rod in it, and it had a melt down. I rebuilt it and kept an eye on it, when my piston pushed my control rod next to the reactor, it failed to stop the reactor and it kept heating. 

Please help me!

Thanks!

 

P.S. I was using Voltz 2.0.4. My voltz version won't update so updating won't help.