Thank you for the detailed response.
For now, we keep adding additional spaces until it gets fixed.

Arya. H said:

Please check your inbox.

Thank you for sending me the files.

Update:
Alternatively, users can add any English character after the opening tag and remove it in the final word document using Find and replace.

Hi Paul,

So I've had a look at this problem and it seems that whenever you have a segment that starts with a tag (formatting or other type of tag e.g. footnote, hyperlink etc.) this problem occurs throughout the rest of the sentence where other tags occur as well. 

If you place some RTL text in front of the initial tag at the start of the segment then all other text is displayed correctly.

I also noticed that if the segment start with a CF tag displayed then the problem occurs throughout that segment within other tags (following a FN tag or inside a hyperlink tag). However, if you turn off the display CF tags via the View tab, then for any segment which would have started with a CF tag the problem disappears.

Hope this helps.

Phil.