Yep, https://itch.io/t/210225/known-issues
It's from a plugin and it's been doing that since I've implemented it. That's why I've replaced the other 2 graphs already.
So yeah, blame the plugin lol
EDIT: Just realized I forgot to include that bug in known issues, sorry!
EDIT 2: Also I've updated Known Issues for version 0.2.8
EDIT 3: This issue has been fixed in 0.2.9