LibreOffice Writer dispalys Extra dash Underscore _ after each persian/arabic character!

LibreOffice Writer dispalys Extra dash Underscore _ after each
persian/arabic character!

I have similar problem in the LibreOffice (version 4.0.2.2). My Ubuntu is
13.04 If I type ÇáÂä in my libreoffice writer, It displays: ÇÜáÂÜÜäÜ
LibreOffice displays a dash (UnderScore): _ after each Persian character
and if I type some characters this dashes may change position or be
reduced:
Ç       ÇÜ
Çá     ÇÜáÜ
ÇáÂ     ÇÜáÂÜÜ
ÇáÂä   Ç_áÂÜÜäÜ
above I typed some samples of what I type what LibreOffice displays. This
problem Only occurs in LibreOffice Writer, Not in Calc, nor in Firefox.