Milestone graph isn't being rendered correctly

Summary

Milestone graph isn't being rendered correctly

Steps to reproduce

Unfortunately, I don't know :(

Example Project

This is on GitLab.com, specifically: https://gitlab.com/sweepsouth/projectmanagement/-/milestones/67

What is the current bug behavior?

Graph is rendered below the burndown chart

What is the expected correct behavior?

Graph should be rendered on the burndown chart

Relevant logs and/or screenshots

See the green graph sticking out at the bottom of the screenshot:

Output of checks

This bug happens on GitLab.com

Possible fixes

Unknown