Mobile view not reflecting color change

Hi,

Firstly, I really love your plugin!

I’m having some trouble with the mobile view for this page. I want to stack each of my columns individually on mobile so that the two rows within each column follow each other. So ie cell containing the number 1 should be followed by the cell below and then the cell containing the number 2 should be followed by the cell below and so on.

When I choose mobile view -> Static top row (enabled and cell stack direction (column) I get the desired view on mobile. However, the color for the cells containing the numbers 2 and 3 are grey. These cells should be part of the header row, how come they do not stay purple?

Thanks for your time.

The page I need help with: [log in to see the link]