I suspect that there is a bug in the code, that is storing the timers incorrectly for lamp modules. Since they use a different type of "on" command that Appliance modules do (they are generally either sent a "Bright 100" or an "Extended Dim" type of command.
What command does the Activity Monitor show when the CM11A is connected to the PC (and the PC is turned on), during the time the timers should be running?
Are the timers for the Appliance modules and the Lamp modules set for the same time?
If so, change the times so they are a minute apart. I have seen issues with my own setup, where timers for different module types that are set to run at the same minute don't run properly.
(That is with AHP and a CM15A, but it might make a difference for the CM11A, too).