published posts show in dashboard as expired

In our admin dashboard, posts that do NOT have an expiration date set are showing as expired (they are displaying in the live site just fine, and in the editing page, the Expires date field shows: “yyyy-mm-dd h:i” as expected, it’s just in the list of posts in the dashboard, they show “expired”).

This only affects my posts from 11/25/2019 to present (36 posts). Previous to that, they do not show “expired” at the end of the title unless they were deliberately set with an expiration date.

Posts that DO have an expiration date set seem to be working as expected.