You should only rely on box 10 if you are comfortable that the number is accurate. It sounds like you may need to investigate it further. If you cannot reconcile the taxes paid on Form 1098 Box 10 and your escrow statement, you can contact your local tax collector to verify.
However, when you review your escrow statement, make sure you locate the disbursements for property taxes. That is what you paid. Monthly escrow is just an estimate of the year's taxes, often includes extra to keep a balance in the escrow account, and property insurance.