Why? I haven't seen that for any other post. I thought there could be only one bump by Community per post. There doesn't seem to be a reason for that. It doesn't get edited otherwise, and it's pretty old now. And it's annoying, it's always on the top of the meta electronics main page, because of that.
Supporting Shadow's answer, as of last Sunday (prior to the upvote given), that was the only question on Electronics Meta eligible for bumping, according to these rules, which I confirmed are still in effect, and assuming my query is correct (it appears to be "close enough"):
Also the 30 day since last activity rule explains why you see it roughly monthly: The bump itself counts as activity.
By comparison, SO has roughly 1.87 million eligible questions.
Pretty sure there is no bug here.
The auto bump mechanism just picks questions at random. On smaller sites with less activity, the pool of "bump-able" questions is small, so the same question can be auto bumped over and over again.
As far as I know, the amount of times question was already bumped is not taken into account and does not affect the algorithm.