Apostrophe problem in the Mail app
When I use apostrophe in the mail app, it automatically changes ' to ’. I have found this problem from the 1st Yosemite public beta, I still have the problem after updating to the official release. I didn't have this problem when using 10.9. I checked my girlfriend's computer running the same version as mine, but hers was fine. Anyone know why this is happening? Thanks.
MacBook Pro (Retina, 15-inch, Late 2013), OS X Yosemite (10.10)