After reaching the end of my feed, it reloads the feed and concatenates it to the end once. Easiest to notice on small instances or with a short “top” sorting.
Scroll to the end and wait a while, or scroll up a few pixels and back again to reproduce.
Thanks for the report!
I’ll be releasing a fix for this issue in the next couple of days. See https://github.com/thunder-app/thunder/pull/2026 for more details.