German umlaut prediction
In German you have the umlauts ä,ü and ö corresponding to a,u and o. Swiftkey X apparently does not take this into account. At least the umlaut prediction is not very good. If I type an "a" it usually predicts and "a" even though an "ä" would be much more likely. You might check your prediction algorithm regarding the umlauts.
Thanks for this feedback. We will try to improve the way we handle umlauts in German.