I had a similar weirdness in my track from the Governor Dick Score-O earlier this year. During a period when I was going straight along a trail, it showed me shooting across the road and off the map, jagging around over there, then shooting straight back. (For Routegadget I just added a ton of blue points and pulled it back over to the trail as best as I could)
If I had my computer I could edit it fairly easily, but I think adding points and editing with the iPad is more difficult, combined with the fact that it's a smaller screen. Pretty bizarre where it thought I was; it's not like there were any large buildings around.