The double-marking has been an issue with the Android app for a while now; I'm not sure what version it started. It's definitely a problem with SBS HD, in that both SBS HD and SBS ONE show up for a little while as recording. I think it's actually a wider problem - when you tell it to record anything, the Android app itself puts little red circles next to EVERYTHING that is that program, including all the repeats later in the week, and that's how it shows in My Week (on the Android app itself, but not on the website). When you come back next time, and the Android app has talked to master control, it's sorted itself out, but it's a little disconcerting in the meantime.
If you're interested in problems with the Android app, another one is that it believes everything is a series, so if you tell it to record something which is a one-off program, it still insists on recording it as a series.
Tim