Because you only get one standard deduction no matter how many W2s you enter. Turbo Tax starts out by giving you the Standard Deduction. You entered more income when you entered the second W2 but you didn’t enter more deductions. And each job only withheld taxes like it was our only job for the year. You might want to adjust your withholding. Also as you add more income you might not be getting as many credits as before.
The social security won't affect your refund except if you have an excess then you get that back.
