Hello there, bitamazonur.
There's a possibility that the employee is set up for a tax exempt reason why taxes are not updated. That said, let's check the Employee settings to make sure everything is properly set up.
Then, try creating paychecks again to see how it works. If the same thing happens, I'd suggest contacting our Customer Support Team for further investigation.
If you have other questions, feel free to fill me in. I'll be right here willing to help you some more. Have a great day.