The point is that they handle double-spacers gracefully and not give them a hard time.
The issue ultimately arose from an issue on the web service's end (the web service is what the Gospel Library apps use to sync everything with your LDS Account). Supposedly, the web service could handle some basic HTML. When a user uses two spaces, the first is a normal space and the second must be converted to HTML for it to be saved. In theory, this should have been no big deal and the note should have been saved.
In reality, however, the web service throws an absolute fit when it's given a note that contains HTML (even if it's just the space character) and causes the note to be deleted. We've fixed this issue and are currently testing it in Gospel Library Beta. The update with the fix should be going out to the non-beta version of the app in the near future.