Although this is very rare it is possible to have a report successfully filed, but not have a green check mark by it.  If you received a confirmation message you have most likely filed properly.  You should also check the PDC website to verify that the report has been received.  You will see the same confirmation number in the top right corner of the C3 on the website as the number in your confirmation message.  Unfortunately, the check mark is part of the filing process in ORCA and cannot be “redone” so you will need to remember that the C3 was already submitted even though it is lacking the check mark.