Sudden drop in refund amount with no changes from me!

I have used Turbo Tax for years. I worked on my 2025 taxes today and went through the entire process of inputting all the data for income and deductions and credits. My refund showed about $6600 due to me. However, when I got to the end to the review and file phase, it suddenly changed the number on me with no change in any of the data inputted by me to about $4900, $1700 less than what I was expecting. When I check the transmission to the IRS, sure enough, it has the lower number on it as well. I am so pissed as I even made an extra IRA contribution today to increase my return only to now find it is much less than what was anticipated. I am fuming and do not know what to do next.

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