There is no explanation of how Turbotax arrived at the number $2528 in line 340 in Schedule 9 in the Carry Forwards from 2016 . CFP section.
To view the carried forward donations, navigate to the Donations section of your return. (If you have prepared your return using the Forms method, refer to the form titled Carry Forwards from 2016 - CFP to view any amounts carried forward from previous years.)
If you have charitable amounts from payroll deductions, check box 46 of your T4 slip for additional amounts.