>There are different possible causes for this. One could be a "extra" face inside the model which doesn't belong there. Use the X-Ray view to inspect the model (it's the 5th button above the preview) If anything shows up in red you might have an extra face or a hole in your model.
I went and checked, and sure enough, I saw some floating red pieces in my shape file. Oddly though, when I reloaded the model, the extra faces appeared in a different location. I also tried looking at the model on my laptop again to check to see if it was a problem with the file. However, I did not see any of the red surfaces. I then reopened the file again on my lab computer and saw no red surfaces. After slicing it, the tool path did not have the missing chunks shown above. It would seem that Cura, on my lab computer, sometimes has trouble opening the file, but then sometimes it opens fine. Any idea why this could be?