ip2geo | IP geolocation service | Web Services library

I have a php script that redirects an user by it's geographic area, something like : if the user is from US,UK,CA(Labeled as Tier1) and is connected from Mobile or Desktop it will redirect to a certain page, else redirects to another page. I am doing the geo verification with an internal ip database downloaded from one of the ip2geo sites, the database is working well..running a query for 365k rows in maximum 0.2s, the mobile detect is done using this class : http://mobiledetect.net/ and the main problem is that when I am running the script the users get lost somehow, like 40% of the clicks are somehow not getting to the source. If I am doing the redirect normally(all the users redirected to the same page) from cpanel it works fine, but with header("Location:") no, I don't have any echo's in the code.