Check by looking at your actual Form 1040. The refund amount that was submitted is on Line 20a.
If the IRS lowered your refund, you should get a letter from them in about 3 weeks or so explaining why.
If you also had a state refund, be sure the 6354 figure is not considering a total refund amount that includes the state refund.
it could also be something as simple as a decimal or comma in the wrong place during return preparation, or reversed numbers, etc.
