My Jaxx 95% of the time since we have had him has had one ear up one hear floppy. He had a couple months around 1 year with both of his ears up. His one ear up has even switched over time it used to be his left ear when he was younger and now it is his right ear that is floppy, I may have that backwards. I love Jaxx's one ear up and one ear down I think it gives him personality.
You will find chis with their ears up and ears down. I love the big bat ear chis but the floppy ear chis are adorable too. I haven't seen a lot of chis with one ear up and one down but I am sure there are a lot of them out there.
Both of Jaxx's ears are floppy late at night when he is tired though.