The "My Caching Chronology" Profile Section not only shows your longest streak of cache finds but your longest slump as well. That's the longest period of time where you didn't cache at all. If you'd rather forget that period of time than be reminded about it, you can now disable just the GeoSlump stat. The option is above the Caching Chronology profile section.
After unchecking the GeoSlump option, upload your My Finds PQ again and the stat will be removed from the Chronology image.