Locus using internal memory instead of external sd card.

My phone is a rooted Huawei G300 running CM9 rom with 2GB internal memory and 32GB sd card. For some reason, Locus seems to be using the internal memory instead of the sd card memory (for saving downloaded map tiles, tracks, points etc). I only discovered this because I was having problems saving tracks, and couldn`t understand why (the internal memory was full). I could not find a Locus folder on the sd card, but finally found it in the emmc directory. As far as I can tell, Locus is the only app on my phone which is using internal memory rather than the sd card! In some ways this is good, because that memory is otherwise wasted, but it could easily fill up again and give me problems. I have tried uninstalling Locus and re-installing (and moving app to sd card), but it behaves the same.