Yeah that's pretty stupid, should play on the same day both weeks. Manly and Melbourne had an entire extra week off so it won't effect them either way.
Broncos have been unfortuneate this finals series imo. They've still come up trumps so far but after finishing 3rd and then winning in the first week, they had to take on the reigning premiers. They win that and then advance take on arguably competition favourites in Manly.