Ohio State tax form is not correctly taking part time residency income its taxing almost the full amount of income between what was earned in Ohio & Florida. Please help

HI! I am doing my son's taxes. He graduated fr OSU in May and took a job in Florida. Total income reported is $31925. Only $5760.was earned in OH. The OH state return is caluculated $25700. I read some of the reply's w/ similar issues - but I need help getting in to the w-2 form. That w-2 form was downloaded. Please advise me how to only have $570. taxed in Ohio. Thank you