There is a bug in UCM/Cbus firmware up to 5.217 which was recently discovered
When Comfort sends a command to a non-lighting application eg Trigger, the counter corresponding to that group address is also changed. Counters should only be changed by the Lighting application group address.
However receiving messages from other Cbus applications does not affect the counter for the group address, it is only transmitting from Comfort that has this problem
The problem will be fixed in the next UCM/Cbus firmware