Typical management. If they put a collector in charge maybe people who have standing orders will not have to call because of not receiving issues. It looks like a souvenir sheet, and they even call it one in brackets, so it must be. But wait, since the margins are perforated they call it a " pane". Anyway they call it both so the pane should be included as a souvenir sheet with standing orders. That is what their website shows also - shown below and taken from their website.

If you don't want the souvenir sheet of 4 "pane" and just want a single you can always order the quartely pack. You will then get all the issues from Oct- Dec 2018.

They were so brilliant I bought the press sheet of nine at the website advertised price of $128.00 cdn even though face was $144.00, when it was first advertised and another community member mentioned it. They did send it to me at the lower advertised price.
And in case you missed it they did put out an overprinted souvenir sheet of the bird issue also this year to Celebrate the 27th International Ornithological Congress in Vancouver. Don't know if that was included in standing order either.
Mike