You could retype the choices to fix the spaces. CSIDE has an option where you can turn on visible indentation–it might help with seeing the differences in indents.
For some reason those accented A’s only appear in ANSI encoding. They don’t show up in UTF+8. If you use Notepad++ to view the file, you can see the difference.
Sorry to hear that. Not sure if this will help, but recently someone asked if they could edit ChoiceScript on mobile, and there are a few suggestions on the wiki page. The error could have been caused by an app using different encoding types.