You should go back through and check your own data entries. And if you imported anything or snapped photos of W-2's----check those carefully. Sometimes those do not come into the software accurately. Watch for misplaced decimals or extra zeros.
And...."online desktop version" is a contradiction. Are you using the desktop download software---with Forms mode? If so that is another place you can look to see if you spot the problem(s).
Or are you using the web-based, online software?
One way you can tell----where is your tool bar? If it is on top you have desktop software.
If it is along the left side, you are using online software.