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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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.