You can discuss it with them over the phone...during weekday open hours: start here:
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
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They will probably want a diagnostic file, and will be able to tell you how to do that over the phone.
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The software does track any modifications you make to a tax file, between the time you complete an e-file, or go thru the mail-file process, but I don't know what it does during the extension process (if the extension is done thru the software itself). What you've indicated so far as what's happened doesn't really make sense to us, and you really need to work thru it with tech support on the phone.
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The -20,000 is unusual. Exactly 20,000? if so, you must have a good idea of what that is "supposed" to be ....like perhaps 20,000 of estimated tax payments moved around somehow and not accounted for? or some other change..... 20,000 accidentally entered as a qtrly estimated tax payment (line 13), but taken out and corrected to a 20,000 extension payment (line 16...but you had to enter that manually later)) ..... at some time or other between e-filing and your start of the amendment ?
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Maybe you know this, but we need to check
....BUT...what you seem to be telling us :
1) You filed an extension and paid with it. (that isn't filing an original tax return)
2) Then you finished all your data entries, and e-filed, or mail-filed your final tax return data at some later date.
3) Now you are amending to correct some other problem with #2.
....did you really do #2? If not, you shouldn't be amending.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
