The button text is positioned slightly toward the top ... line height or something is wrong. E.g. the "Run" button.
Basic form components
Going to resolve this as part of some core styling done in JENKINS-39563
PR pending discussion: https://github.com/jenkinsci/jenkins-design-language/pull/117
Appears to be a core issue with Lato font itself. Putting this on hold until (if?) we get an answer from Lato team.
IE11 is going to be EOL'd this year so I don't think this is important unless it breaks functionality.