When using Star Chart purgers on planets it is possible by clicking fast enough to have a planet disappear from the planet list, as well as lover the total number of scanned planets, and use up the purger and the energy involved but then once the planet tab is refreshed the total goes back up and the planet re-appears. I have found that the message for the planet having been purged has a blank in place of the name of the purged planet. Has anyone else had similar problems?

Yes, and what causes it is exactly what you've placed in the title of the thread. You are clicking to fast to purge the planets.

On occasion, the game takes a little longer to respond, and when this happens, the little arrow thingy where you click to "fast-click" purger from, will flash so to show that the game is taking longer to respond. If you ignore that, and do the process of fast-purge over again, then you get the message that you described, where it says ": Planet has been purged from your database" with no planet name.