The latest version of Lightroom cc 2015.7 seems to have a bug. When I ask it to downsize a photo on the long edge it gives me the photo with those dimensions on the short edge. Anyone had this problem? Older versions work fine...I just installed this on a new computer, so wondering if it's a new bug.
Is the image in portrait or landscape orientation when this happens?
Have you tried it with an image in the other orientation?