Odd thing I've noticed before, though closing and opening Construct solved it, is a couple random objects in my layout having invisible borders. These are walls and platforms I haven't moved at all since I made the little test area to hop around in.
Oddly enough it's displaced the wall to the left of where you start, and the first platform up and to the right.
<img src="http://72.29.78.167/~revolth1/img/construct-example3.PNG">
Controls are A(left) D(right) and hold Space to charge your jump.