Check 1040 line 30 for any amounts you didn't get during the year. It will be included in your refund or reduces a tax due. Did you get any of the 1st or 2nd stimulus payments? (don't worry about the new 3rd one yet, that comes separately). When you filled out your tax return you needed to enter the actual amounts you already got to see if you qualify for any more. But that has been the most common reason for the IRS to reduce your refund. People have been claiming the wrong amount on line 30 when they already got the stimulus checks.
I didn't understand the rest of your post.
