Text Style: buggy when font is symbol (FontAwesome)

Hello.

I had the idea to replace the rating stars (small images) on my website with a text field with FontAwesome symbols.

This works in principle. You can adjust the font size, color, alignment, and more, just like normal text). To make my job easier, I created a new text style (font is symbol) for it.

And now the problems start:
The name can only consist of CAPITAL LETTERS
If I now switch from desktop to smartphone layout, the font size can be changed and saved, but this change then also applies to the desktop layout.

Back to the first layout, “Revert to Style” has no effect. There is no individual saving of the style per device.

Is this a bug, is it intentional, or do the icons play the decisive role here?

Mr. F.