Some Middle East instruments not playable via my midi keyboard.

Is this normal, or am I doing something wrong? Some of the Middle East instruments play via my midi keyboard, but not all. There is no difference between them, I can tell. I'm just changing instruments to try each one out and some will work and others won't. To hear the instrument, I have to use the small keyboard under the instrument in Kontakt. Using my midi keyboard for all of them would be much preferred. :-)

ps. I see now that this is the case with instrument sets, not just Middle East. Is there a way to make all instruments work via my midi keyboard, not just a few?

I recently bought KOMPLETE 13 and am working my way through hearing each instrument. I'm looking forward to upgrading to KOMPLETE 13 Ultimate soon! Great fun!!