You claim the tuition credit, based on your own financial records, not the 1098-T. If the amount is less, then that's the amount you use.
That said, it is unusual for that to happen. The amount in box 1 not only includes what you paid, it also includes amounts paid directly to the school by scholarships and loans.
That link should be there. If not, just change box 1 to what was actually paid, according to your records.
