I've seen What is a neutral atom?; it is a question, it has an accepted answer, but (maybe I have some misconceptions about that) is "refreshed" by the "Community" user.
Please help me understand.
This is not a bug.
There was an answer that was marked as spam, offensive or nonsense. The answer and the user were therefore deleted. This intervention is indicated as “modified … ago Community ♦ 1”.
Note that you need 10 000 reputation on this site to view deleted posts.
I do a little bit disagree with Loong's assessment. Here is the events in order:
TL;DR The bump was caused by the creation of the post. The user was deleted as well as the post. Since no user could be shown, the Community user was shown instead.
Extra info The deletion of a post does not bump a question. This happens silently.