The Fill & Sign app doesn’t handle MENA language text correctly; the word order of the characters gets reversed when you save the changes or come out of the app.
The problem is fixed in the October 2016 release of Acrobat DC. To get this fix, update your Acrobat (Help > Check for Updates).
To fix this problem in Acrobat Reader DC, install the Asian and Extended language font pack. By default, the font pack is available in the MUI Reader installers. You can also download the font pack from the following link: