Fill button is nonresponsive

I had just finished programming a drum beat on a drum mode track with some chance and math added into a few hits. After that I went to press the fill button to add some drum fills, but the fill button is non-responsive, and the drum beats entered into the grid are dimly lit, compared to bright as normal.

It would seem any time I hold a step, and dial in some chance or math the pads seem to dim, and then every step I press after that, additionally adds chance or math to the next step as well and then of course the problem trying to get into adding fills next.

So I guess the problem is two fold…
When I enter a step and in dial in some chance or math. Sometimes chance or math is applied to the next added step as well, and sometimes it is not….how do I get the next step to not copy the same chance or math. And how do I get my pads to go back to normal (non dim).

I’m sure this is just me being new to this device and some thing I’m doing incorrectly.