New sellers who want to remain at the top of the search results have been complaining about this very thing for years. It is not a bug, and it is not new. It is how the Fiverr search system works.
This sounds a little selfish. Maybe Fiverr wants to give those “poor performance gigs” a chance to improve their visibility and performance. Why do you feel that your gig does not have to compete for visibility? There are thousands of other sellers who want to be at the top too.
And I can assure you, gig rotation is not new, nor is there anything different with how things have been working now, than they were before. Just because your gig has entered rotation, doesn’t mean that there is something wrong. Not every seller can be at the top. Like I said… rotation. Your gig might be at the bottom now… it could be back at the top in a few weeks. No one is entitled to be on the first page, just because they think they belong there. We all rotate in the results. It’s how the system works.
A bug in how analytics are displayed has nothing to do with where your gig is in the search results. It’s an analytics display bug. Fiverr has even said as much. The algorithm is working exactly as it is supposed to, which would seem to be evidenced by what Fiverr has told you, specifically.