That's common.  It just looks that way because you put them in as separate W2s and saw the tax due change in between them. If it all was on one W2 you would get the same answer. And each job was withholding like it was your only job.

Because you only get one standard deduction no matter how many W2s you put in. 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 your 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 like the EIC credit.  And it was probably giving you the EIC credit until you went over.

See, https://ttlc.intuit.com/questions/2273878-why-did-my-refund-drop-when-i-entered-another-w-2

I think I only exempted from 2 jobs, what's confusing me is not getting anything back since 500-353(amount owed once I entered my 3rd W2)=147 yet I owe 250.

Was 500 a refund?  Then the difference is really a $853 change to the other direction.  Maybe it's showing you federal and state combined.  It does that at the end.  

Look at your actual tax returns to see what you owe on each one.  You can preview the 1040 or print the whole return <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/replies/3302322">https://ttlc.intuit.com/replies/3302322</a>