Not sure when this started happening, but the new contributor hover information now makes a scrollbar appear, and keeps all of the hover card information constrained to a small area surrounding the post.
Here's a gif representation, from this question:
This appears to happen on every site I visit, so I assume it's network-wide.
I'm using Chrome version 88.0.4324.182 (Official Build) (64-bit) on Windows 10, if that matters.
Could this be looked into and fixed?