I have a handful of parts that are grayed out on my Price List. They appear to be set up and calculating correctly.
There could be several reasons:
The logic applies some formatting to the cells.
Result price can become gray if its value is changed using Manual Override.
If the logic allows manual overriding of outputs (the Allow Override check-box is enabled), then outputs are grayed out if they are manually overridden.
This is hard to say without knowing the context. Please check with your Pricefx project team what the specific reason is.