If the transport buttons does'nt send any other messages than MCU or HUI messages to your DAW, then they don't do anything in Pigments.
Furthermore the change isnt triggered directly. The change applies after a few seconds, without using any key of the controller.
This sounds like you have some automation going on in your DAW. I assume you start the DAW with the transport buttons, and after a while the automation step in. Have you checked that?
Look at the automation in your DAW-
Also the sound you use can have some modulation going on. Do you use a Factory preset in Pigments - if so which?
Do you hear changes in Pigments default preset?
Is there maybe something like a "midi watch" that shows every triggered midi note? Maybe I can see what is going on then.
In Pigments you can see the played notes on the virtual keyboard. And the modulations can be followed in the Center modulation strip. The rest is about your DAW.
Do you know how to use your DAW Ableton Live?