PS: If it is connected to this rule:
"The submission period is from the 10th to the 17th each month."
Then I highly recommend putting that information on the group's main page, because that is really essential.
Because it is not clear from the main page that such rules are existing.
This sounds totally optional, not obligatory.
But once you click on that link, the article says:
Which is clearly obligatory. I hope you see the logical conflict.