It has to do with the timing of the payments and how the IRS spread outs your income evening over the course of the year (which you are permitted to override if your income was “lumpy”
There are a few bugs others have reported
By chance did you write in a reason (even if a dummy reason) in the explanation section ? It doesn’t create a red exclamation point if you don’t (another big on my view) . Manually click the error button in Forms View
