well squidoo lenses USED to be a good ranking landing pages.but not anymore...you have to do a lot of work to rank it and even then its too easy for a competitor to outrank your lens with a website

Is the lens new? If so, then this is perfectly normal. New webpages will rank well for the first few days, and will then disappear for a little while until Google's worked out what position it should have in the SERPS.

Your lens will hopefully return to the Google results, though it's position will depend on how good Google thinks your lens is, and how much other competition there is for the same keywords.