Have you maybe not configured Adapt to run in RTL mode? If your course will only ever be in Arabic then you set _defaultDirection in config.json to "rtl".

If you are creating a multilanguage course then you probably want to use the languagePicker extension, instructions are provided in the README for that extension.

Or is it that the text is becoming 'fragmented and in reverse order' whilst you are editing the JSON? If so then sorry I have no idea how to fix that as we're always provided with completed Arabic JSON files from our translation suppliers.