I think I suffer from the same problem, I often see some "3" and "7" in the words, I don't really think it's normal...
Even if I can't read Arabic, any help will be appreciated, thanks in advance !

__________________
If you put a large switch in some cave somewhere, with a sign on it saying « End-of-the-World Switch. PLEASE DO NOT TOUCH”, the paint wouldn’t even have time to dry.
Terry Pratchett