Because you’re setting the very general-scoped cells styling, which is used as the “default” for any cells which don’t have their own style attributes defined in props.data. You need to set the style for just one cell of data in props.data by modifying the style attribute of some “cell”. I’ve assisted with that ina. neighboring thread: Change style of cell (component Table) via script - Perspective - #13 by cmallonee
You shouldn’t be handling the logic like this.
What I recommend is you place all of the display logic into the table. If you need to update a value in the dataset, feel free to do so wherever, but let the Table itself resolve the binding and apply the display logic based on the new values.