Missing interests in Open Targeting

That might happen because of two reasons. Firstly, it could be because of the language of the Facebook API. The Facebook API is in English, so not all interests are available in your language. Therefore, you need to find the English translation for the interest you want to include.

Secondly, it could be these interests are not available anymore. Facebook is constantly adding and deleting interests from the open targeting options, so this is very likely to happen.