Question
I have a hydrotek 2120 with 4 zones. When it is in timer mode the first station comes on, then turns off for the switch to the next zone and the first station comes back on again.  If I manually click it off and on the stations will switch.

Answer
Sounds like a problem with the controller.  Try resetting it by disconnecting the power, including any battery backup, for about 5 minutes, then reconnect.  Reprogram according to the manual.  If the same problem occurs, it may be time to replace the controller.