Can you tell me why my 2018 says it rejected , but when I go to fix it I get a message that says your taxes have bee filed with IRS. I need to know if it was or not?

[DawnC0]

Check your status here.  Online E-file Lookup Tool  This link also has a link to the IRS's website.  

You may have multiple accounts that you tried to file from so the reject may be from another account.