I will take a look at the templates to see if they are the issue or in fact what might be causing the issue. For my own writing, I use a slur to indicate sweeps and an X above or on the stem to indicate crossovers.
If I had to venture a guess as to the 'cause', it is related to the percussion layout maps. These layouts specify which notehead is used for the various drums and effects and the corresponding staff placement.
If I had to venture a guess as to the 'cause', it is related to the percussion layout maps. These layouts specify which notehead is used for the various drums and effects and the corresponding staff placement.