Lumetri color isn't working in it's defined mask

[Jack24443636o995]

Trying to lower the exposure of a TV in the background. Created a mask around it. For some reason, it's seems to have created it own rectangle of where the color effect is being applied? As you can see from the picture, only half of mask is being filled out, while the effect continues much higher than the mask outline. What gives? I've tried rendering, creating a new mask, etc. but nothing seems to fix it. None of the mask parameters seem to affect it at all. 

[Ann Bens]

Make sure your OS scaling is set to 100% or the recommended.

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