Markdown: horizontal lines don't play nicely with `align=right`

Summary

The horizontal underline that is rendered underneath headers overlaps images that are positioned using align="right".

What is the current bug behavior?

Here is how my project's README renders on GitLab:

image

Notice that the horizontal lines underneath the Install and Purpose headings stretch over top of the image.

You can view this for yourself here: https://gitlab.com/nfriend/ts-key-enum

What is the expected correct behavior?

Here is how my project's README renders on GitHub:

image

You can view this for yourself here: https://github.com/nfriend/ts-key-enum

Steps to reproduce

See the source for the README in the screenshots above here: https://gitlab.com/nfriend/ts-key-enum/blob/382de111bdbafce990786370e57be2de6d3d34fc/README.md

Example Project

https://gitlab.com/nfriend/ts-key-enum

Output of checks

This bug happens on GitLab.com