Sounds like the key here is that you don't have an ME enabled version installed (which has those extra settings for story direction).
If you change the language settings in the CC Desktop App using the Gear icon I believe you should be able to download the Arabic/English version to get what you need.
Can you explain why the orientation works in the one instance ? ( the second example ) as you are correct, we have no ME edition installed.
I don't set RTL text, so I really can't tell you, but my guess, since you mention the returns is it's the story direction, or paragraph direction setting (in the style, if there is a paragraph direction -- I'm not sure there is). You really do need to download the right version of ID to do this.
Thanks Peter. That has worked. Panic over. Appreciate your swift response.