Some are...but usually it is for a situation where:
1) They e-filed Federal separately first, and haven't had their Fed tax return "Accepted" yet. They have to wait for that before they can e-file the state when done separately.
or
2) The state involved isn't accepting e-filed state tax returns until later...a number of states require waiting until later in January....and some state e-file "software" forms aren't ready until after 26 January.
@Bigj921 , might depend on the state. Some states aren't allowed to be e-filed yet...and at least one, I think e-filing was stopped to correct a couple problems (Indiana)
Check back to try again on the 27th, but I seem to recall one state wasn't starting e-file until 2 or 3 Feb (don't recall which)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*