After you file

On the credit line it said I received a 1800.00 credit it originally in the refund area it showed it was going to be a 37.00 dollar refund then it went to a blank screen for a moment for a second and came back and said I had a tax credit of 1800.00 then the total refund went to 1837.00, I just looked up Federal refund and it kept saying it was in process, and I couldn't figure why it was taking so long then I checked the site it  again and it said my refund was only going to be 37.00 and they said they will be sending an explanation letter why the refund was reduced.