It's not a problem of N9N side, this is your fault!
Are you using original Bitcoin Core?
Oh sorry, forgot to mention it wasn't mine I just didn't understand how the balance on the address was so high, then I saw that transaction.
Sorry, was me. I sent it without fee by accident and then saw it to late. I searched for any chance, to add the fee later, but found no one.
It was my initial deposit, so was the delay not a really big problem for me. For the next ones, i will doublecheck this, before click the send button ...