In general, your W-2 form shows how much of your income was reported to the IRS and the State tax office. The Federal and State wages should be equal, however not all W-2 forms report the same wages.
In this case, the system will ask you to allocate your actual wages in each of the States you worked in.
Please check your payslips and calculate how much of your total Federal wages reported in box 1 are earned in each of the showed states.
The sum of the allocated wages in each state has to be equal to the Federal wages in box 1.
Info: You do not need to change the amounts on the W-2 form itself, instead you can just allocate the amounts below the form in Sprintax.