Can't imagine any reason for this but many standard unit names in the OoB editor lack their final character. This is mainly a problem of German units (Austrians and Bavarians). I.e. Regiment Kronprinz is spelled "Kronprin", von Simbschen "von Simbsche" and so on. German speaking people have no problem to complete the names manually but others maybe don't identify these errors. Should be corrected.
If needed I could create a list of these names.