command problem?

[PULSEOX]

Hi:
I'm using the "Trigger Maru" mod-which I like very much. I'm just confused about the command buttons on the bottom of the screen.
If I understand correctly the currently activated button should turn from yellow to green and back to yellow when you de-activate it, right?

My problem seems to be: they won't stay green. For example when cruising on the surface-if I go to the radar fuction and hit the on/off icon, and then the continous sweep icon-they turn green.

But if I exit to the bridge the next time I go back they're both turned off again...
does this mean the radar becomes ineffective if I don't stay there and watch it?

Also, sometimes the sonar icons won't turn on=no matter what I do.

Is there something I'm missing here-or is this a "bug" I didn't know about?