It happened sometimes rank shows in different places. but if you need to know perfect ranking check your google webmaster tools.
Actually when we put a search term in the search box of the Google, the search is completed by the software, It is tried to search the exact match with our search term then various related searched where any word from our search query appears and then show that before you. When a search query is placed it is searched in the database of the Google and displayed the related results with your search query. The problem you are talking about is actually happened with every search term, Google show million search results for that and when we go at last after omitted results, it shows 50 to 70 pages last. And this is the limit shows in my opinion because, it displays the results according to your search term from the connected data center, So it founds only that from the indexed database of the server and shows you. And you can say this term also that no one has so much time to check all the 50 or 70 pages, every one wants his result just only in max five pages. And this is the fact also for the online business, if you want to search a tour operator and put a keywords then it is sure you will check only max 2 to 3 pages results and would not try to go more. Sorry I keed, I keed.