I e filed a 2018 1099-MISC form, but the amount in box 18 was incorrect. Since this amount was for state purposes, was it included in the e filed information?

Look at your state tax return to see if the amount was included on the state tax return.

To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)