Mercury is in Sagittarius but in my ninth house which is in Scorpio - what does this mean?

As you all know, the lines on the birth chart wheel don't always match up. In my case my ninth house is in Scorpio, and Mercury is IN my ninth house yet it is in Sagittarius (as Scorpio shortly cuts off and becomes Sagittarius). I am extremely lost on how to read both these conflicting things. Any ideas?

Sorry if I didn't explain that clearly and/or if this question has already been asked...

The 9th House is Sagittarius home.
Check if Pluto is getting some kind of aspect with Mercury.

Mercury in the Sagittarius:
With your natal Mercury in Sagittarius, you think big and skimp on the details. The little stuff doesn’t mean much to you, but the wider perspective gets you, and you can be a visionary. You’re optimistic in your communications, and can easily make people feel better about themselves and their life. You just may be a little out of touch with reality, or gloss over it. You don’t care much for structure and order, believing it’s a waste of time and energy. You’re enthusiastic, but you can be preachy at times, so you need to work on listening to others better. You just love a good debate, and have a hard time pulling yourself away from one. You can be blunt, humorous, and a great defender.
Mercury in the 9th house:
With your natal Mercury in the 9th house, you’re always on the hunt to learn something new. There’s no greater quest than the quest for knowledge, at least in your mind. By learning about so much, you feel that you expand your mind and your life. You can step back and see the bigger picture easily, though you can overlook the details. You like to share what you’ve learned rather than keep it for yourself, and find joy in teaching others. You can be blunt to a fault, offer your opinion when people don’t want it, and need to learn to censor yourself a little if you don’t want to find yourself in trouble all of the time. You seem positive and enthusiastic in your communications.

source: http://www.thedarkpixieastrology.com/natal-mercury.html