Looks like there's some kind of injected CSS malarky going on here:
When the window is narrow:

When you get wider, the info starts running off to the right:

I would _suspect_ that this is a "Github Enterprise is older with different CSS" issue?
Turning off RefinedGithub for the domain and the issue goes away. Turn it back on, and issue returns.
Adding:
body:not(.full-width) .repohead > * {
padding-left: 0 !important;
}
to the custom CSS for our enterprise domain fixes the issue.
We can push a hotfix for this. Does enterprise have any classes on body or html?
Adding:
...
to the custom CSS for our enterprise domain fixes the issue.
Confirmed to fix it for my case.
My enterprise page
<!DOCTYPE html>
<html lang="en">
...
<body class="logged-in enterprise env-production emoji-size-boost min-width-lg">
Will be fixed by https://github.com/sindresorhus/refined-github/commit/120de1b0ebaba019d9775705907c652bbdd770a1 when it's deployed
Update: 20.7.10 released
Keep an eye on these numbers:
Removed my override, updated, problem gone. Thanks!
Can confirm that 20.7.10 fixed it for me! Thanks for the quick turnaround 馃憤
Most helpful comment
Will be fixed by https://github.com/sindresorhus/refined-github/commit/120de1b0ebaba019d9775705907c652bbdd770a1 when it's deployed
Update: 20.7.10 released
Keep an eye on these numbers: