I think that has to do with light mode being really really fucking old -- like, the HTML that creates it is really awful. It's probably picking up some unintentional CSS styling. It's really minor, though, so I'm not too fussed about it.
(I should open a bug to create a light-mode scheme with markup that was actually written in this century, though.)
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(I should open a bug to create a light-mode scheme with markup that was actually written in this century, though.)