Hello @foosantos. Thank you for your reply.
Look at this picture: https://prnt.sc/d9zCqkrYGBoF
See the page on my website: https://napravisajt.net/sample-page/
It’s Twenty Twenty-Four Theme, Sample Page.
In the first paragraph, I left the default text font M = 1.04 Rem = 17 Px. In the second paragraph, I increased the text font to 1.25 Rem = 20 Px.
The text in the second paragraph is, as expected, larger.
Now view that same page on your mobile phone. You will see that the text in the second paragraph is smaller than the text in the first paragraph. Although the text font in the second paragraph is larger.
The problem is that when you increase the font size of the text, that text on the phone becomes smaller, instead of bigger, like on the desktop.
There is another problem. Before I added the second paragraph with a larger font, the first paragraph, with the default font, looked small on the phone, and when I added the second paragraph, then the default text in the first paragraph became larger, even though I did not change the font size in the first paragraph.
I think there is some bug regarding the size of the text font (Paragraph block) on the mobile phone.