As mentioned above, ignore the dance until it settles. Don't whisper a word or write crap about your position until it settles. So what bouncing means?
In simple terms: G has loads of data centers spread around the globe. When the algo updates the index, it can not do all of them at once. It takes time to consolidate massive amount of data changes using the BigTable (ex-MapReduce). Once all the data centers updated, you got your position, until variables change again. If it keep dancing for longer than you expect, it means the algo keeps making changes to the index, the other centers keep catching up.
Go and do something useful until it settles.