Arabic font does not render properly

I have a font called ‘me_quran’ that looks like this:

Unfortunately, when FFMPEG renders it, the vowels (the little lines you see) are either too high or too low on the letters.

I think this is due to the way FFMPEG renders the font, but is it possible to correct this to have the same font as seen in wordpad?

ps: the text on the video is rendered in a .ass subtitle file.

Thank you