Home Panel - Buttons

Hi all

I couldn’t find a sub-section for Home Panel, mods feel free to move. I have just started trialling Home Panel as a possible replacement for HADashboard. I am getting a strange issue with buttons though. Some seem to toggle the colour of the icon, and some seem to toggle the colour of the entire button, leaving the icon the same colour. How is this configured, as I am using defaults for both. The only difference I can see is that one is a switch entity, and one is a light entity.

In the image below, both entities are turned on: