Grand master won't control a scene set as htp

Hi, I have some scenes saved for some stage washes and then I have them loaded to some playbacks and set to HTP.
But for some the grand master will not control one of them.
I've deleted and re-recorded the scene but it still stays at full even when I bring the grand master to 0..

I'm using the rgbw generic fixtures and the white is the one that the grand master won't control.

Does anyone have any ideas?

Thanks
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