Runs from the orienteering sports profile in Polar does not get imported automatically as the runs do. I personally would like to have them imported when I press the synchronize button. I believe you should consider adding it as a sport profile that can be imported as a run.
Otherwise, I have not found any issues with the import from Polar, loving it so far 
@helge.hagen Unfortunately, we don’t really plans to import other activity types in the near future. Although, we might consider it when we develop our mobile app