I have 3 w-2 to fill out. I made more money on one of my w-2... I’m getting more back on a less amount W-2

You can't pay an attention to the amount of refund you are getting until you have entered all your income and other information required on your tax return. 

When you enter your first W-2, the standard or itemized deductions are subtracted from the income before the amount of tax due is calculated so only a portion or maybe none of the income is being taxed and it appears like you are getting most or all of tax withheld as a refund. When you enter the next W-2, most or all of it is being taxed since there are no more deductions left to subtract. There is not enough tax withheld on that income to pay taxes on all of it so the refund goes down. The refund shown after entering the first one or two has no meaning and should be ignored. If all of your income and withholding from all jobs was reported on one W-2 the result would be the same but you would not see an interim refund amount that has no meaning.