was due to the high flyers operating into Gladstone
BPA is quite correct, of course if the precious darlings didn't transmit that they're inbound to Gladstone from 50 miles away and at great heights then they wouldn't hear, or have interference from, traffic at Caboolture and Caloundra.
Another missed opportunity here to split the frequencies so that YCAB and YCDR aren't on a common frequency; it gets quite busy at times, and given identical runway directions it can be rather confusing too...