[Usbflasher]

Its simple. Its called "account overtaking" and is one of the methods sites use to avoid people using hacked accounts. Like your account got created in Los Angeles, but you are now using it to buy something in Florida. There are a lot more reasons why you can find some by using google and the term account overtanking and by reading some science journals about it. This is the best way to learn about it, but people dont want to invest time.