Sorry I mean servo are all brand new. The radio and Rx have been used but never had this issue... Ive changed the Rx to an ar8000 from my quad copter and it's doing the same thing... So either I'm not setting the radio up correctly or the multiplex servos that come in the kit can't figure out where centre is.
I'm going to disconnect all my linkages tonight and check to see if the servos centre then... If not check them on another channel... All my other channels seem to centre.