That is a distinct possibility. Insteon devices are good at not stepping on each other. X10 is not. The fact that Insteon traffic is being generated by the X10 messages may not be anticipated by the alarm system. Without any ACK built in a House/Unit message could be getting lost in the powerline traffic. This would cause the next House/Command message to trigger the wrong Group.
Reply To: EZX10RF putting out wrong addresses 2017-12-21T14:50:58-08:00