Love CSS and simple layout... check out comments in the CSS file, very interesting.
On my todo is to make footnotes collapsed by default on mobile, so you tap to display them. Right now they are always present and so interrupt the paragraphs. I don't like this, and it may be what you're seeing.
I am not a super expert on HTML and CSS and I can tell that it's going to take a few hours to fix (it's not even the first time I've tried to code it.) So, right now, my apologies to everyone on mobile. I hope I will have it fixed by the time I have another article on the front page :)