[–] grrrandma Developer 1 points

Thank you for the bug report. I've seen this too, sporadically. It happens either when there are a few comments tied at the same score, or if someone else voting changes the comment scores in between when you load the page and when you click on load more. Unfortunately I think it will take rewriting comment loading to be significantly smarter than it is now to make this completely go away. I'll add it to the bug list.