Comment macros not working with failover backup

I have some scenes in my show which just use comment macros to fire keystroke macros.
When I have a second console networked in with same net number and running server then the comment macros don't trigger.
If I change the net number on the second console then they work.
First seen in 2.4, upgraded to 2.5 and still happens.

2 x Hog 4 and 2 x DP.

Leggy.