It's important to add a good number of track points when manually drawing a course. Each fence should be separated by at least one track point.

Here are some steps to help resolve the problem:

  1. Make sure to have a track point between fences.
  2. Make sure all fences are snapped to the track. To check this easily, go to the “Distance Table” (Click the info icon). If a fence is missing, it is not snapped to the track.
  3. Go to “Edit Map” -> “Edit Fences”. Move the “missing” fences a tiny bit along the track to snap it back onto the track.