Text Formatting

Hello

I have bolded the text in the top row, and in the first column, and it appears fine in desktop view (naturally), but in mobile view the formatting is lost in the top row (which becomes the first column)

This is better explained with screenshots, see below

Desktop: https://pasteboard.co/KaHJH8w.png

Mobile: https://pasteboard.co/KaHKVTN.png

Can you let me know how to maintain formatting please?