Reply To: Font Automatically Changes when Inserting Speech Marks?

That’s a good clue that makes two ideas spring to mind. The first is that there’s a glitch in the font itself, which you could check by trying the same procedure using different Arabic fonts. The second is to check if Positional Forms in the OpenType section of the style sheet is set to “Automatic” rather than General, which is the default.

It also suggests a workaround. A GREP style should be able to force the font to Lotus LT, sparing you a great deal of debugging time.