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Banks often do this if they can't verify your identity/address based on your application and the info on your credit reports.
For example, if you move, then apply for a new card before the new address is reported on your credit reports by your existing creditors, the new creditor will need to verify your information.
Also, discrepancies on your reports could cause this. If you haven't moved recently, you may want to pull all 3 of your reports and check them for any errors or discrepancies.