Logic Pro sends unwanted midi Messages to external synth

Just for the info I'm running on:

Mac Studio M1 Max

macOS 14.5

Logic Pro 11.1.1

My Roland Fantom 08 Firmware was 1.04 and I upgrade it to 1.05.

On both version I have the same problem.

The Synth played Mono after changing things in Logic Pro 11 and need to be reset.

Very interesting and the mystery is even bigger.

One small addition: When I am in a Logic instrument and change to another preset (sound), then my Roland sound change to mono too. Depending on which preset I select in the Logic instrument, the sound in my Fantom change to mono or stereo (or half stereo).

Now back to the issue: When I switch to another preset in the Logic interface, I expect a midi message out (because my Fantom changes as well).

But there is no midi message. The monitor is working well I think. I see notes on and off while I playing the keys on my Fantom. But it doesn't monitor any midi message's from Logic to the fantom when I change a preset in the Logic instrument.

Now it comes: when I plug out the Midi connection (in case of the Roland it is the USB), there is no problem. The fantom stays in stereo. So somehow there is a signal via USB from Logic to the Fantom but there are no midi messages monitored. Maybe in another layer or protocol.

Great, I will try the monitor. Thanks!