Hey James,
We have a known issue with the Burger lines and we now know what’s affecting it. it’s the Minimum Font Size of the Chrome Browser. I’d like to go back to Ben’s suggestion to quickly check if that is also your case.
If there’s no issue with other browsers like Firefox, it’s certainly the Minimum Font Size of Chrome. You can disable that by clicking the 3 dots at the upper right corner of the browser.
Click on Settings > Appearance > Customize fonts
Make sure the Minimum font size is set to Tiny.
That is, by the way, the default setting of Chrome.
Thanks.