I'm working on a page ([zacvhogan.github.io](https://zacvhogan.github.io)) and have found that the body text of the site has varying font weights. It's as though with each nested element, the font weight becomes heavier.

Why would this happen?
I've looked through the CSS and inspected and compared the various text elements in Chrome Dev Tools to no avail.

Source code: <https://github.com/zacvhogan/zacvhogan.github.io>

Comparison below. Yellow boxes indicate nesting.
[![enter image description here](https://i.stack.imgur.com/Xu3NX.jpg)](https://i.stack.imgur.com/Xu3NX.jpg)