Aktiv Grotesk Rendering Issue
Font randomly stopped respecting line height. This only happens for Aktiv Grotesk. Temporary solution is to set line height explicitly and change display to inline-block.
Multiple instances of other people experiencing this issue going back five years:
https://forum.squarespace.com/topic/258936-sudden-change-in-hyperlink-underline-appearance/
No known reason for the font to begin rendering incorrectly.
New instance of the same previously reported issue:

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Nathan Peretic commented
I don’t know if it has been resolved. We gave up a week ago and began using a web version of the font directly from the designer. You should be able to reproduce directly on fonts.adobe.com unless you have actively corrected the issue on your end.
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Thank you for submitting this feedback. Is this issue still persisting? Which applications and interfaces are you seeing this issue in?
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Cotton Bureau commented
Following up to note that Gibson is also off, only 1–2 px, but still off. This change likely occurred at some point in the last 7–10 days. For Gibson, the additional space is above the line instead of below.