I have no idea what UI that is

It's a custom application (for release management).

The UI is the standard search UI though (with status icons).

The problem is we'd never ship those icons specifically because they are bad choices for visualizing information. If you want to submit a fix, that's fine, but I don't understand why you're asking us to make your UI look better.

The issue is here as well in Differential, just less noticeable:

You're welcome to submit a fix, I don't anticipate revisiting this component for some time. For the most part, most icon stacks are aligned on the left edge in Phabricator, but it's not consistent and at some point we have to move on to the next project.