I mailed my return 3 weeks ago but forgot to sign it, I looked at the IRS website and nothing. I efiled this morning and it said approved but received my state today?

I am trying to understand how my efile was accepted but I received my state today? I mailed my federal and state return to the state department and forgot to sign it. I was wondering what was going on since I could not locate any information online so I rechecked the return I sent and noticed it was not signed and I sent the federal with my state when I was suppose to send it to a different state. I was trying to download my return and resend it and it was not able to so I efiled again assuming it was going reject my return again but it accepted it?