Arabic font ه (haa) does not reflect the proper form at the end of the word. All words such as لهذه and كتابه are mispelled with the begining form of the letter هـ, where as it should be the ending form of the letter, ـه or ه depending on the word.
This mistake happens in the Language Reactor Chrome Extension. When we switch off the chrome extension and just view the subtitle from Youtube button, it is reflecting correctly (meaning the problem is with the Language Reactor extension).