When you removed the cylinder, did you also remove the side plate? If so, did you replace the side plate screws in the same locations as they came from? The front side plate screw that holds the yoke in place is a fitted screw, even though it may look like the other "domed" screw.
I'd try backing the retention screw out and see if the yoke seats fully, hold it in the seated position (but not latched closed) and then tighten the retention screw while you test the yoke for freedom of movement. If yoke movement is not free and easy, with no end play, try reversing the two side plate screws (the third flat headed one should stay where it is under the grip half).