With the recent Thulean* comment spam attacks, mods have dutifully deleted the offending comments, but Thunder still renders the deleted comments.
Connect seems to have the same bug
Voyager and Jerboa show the comments as deleted
Examples:
https://startrek.website/post/8228446
So that’s what it was! I saw several comments followed by a mod child comment stating “Removed for XYZ reason”, but both parent and child commments were still there.