In short, in this phase only the 5 top ranked designers can send new entries. I've checked the contest right now and the other designers should be able to send new entries. You've done nothing wrong. I advise you to contact LT support (
https://logotournament.com/help/contactus ) to tell this problem. If the top 5 phase ends without a solution you can contact admin after and ask to send the contest back to the top 5, so do not worry.