Since you have already filed your return, once it has been processed, you can submit an Amended Return.
If TurboTax applied your January 15th estimated payment to your tax paid amount, that would be correct. I can't explain why an extension form 4868 was prepared if you didn't request an extension. We could take a closer look at this if you're willing to submit a sanitized copy of your return to us (all personal info removed).
If you wish to do this, go to the Online link at the top and choose Submit Tax File to Agent. Post your token number here.
@TUMARK22
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