I have encountered an anomaly for slur placement for certain split-voice chords:
Note that the beginning point of the first slur is directly below the stem. I can move it upward with a marker, but then it collides with the stem. It seems to do this when there is a beamed note on the other voice for that chord.
The slur on the final two notes is what I would expect the first slur to look like.
Thanks for the report. This will be fixed in the next update.