In blueprints, when we use transform, the rotation of X actually rotates Z and rotating Z actually rotates X.
You can test it out with this simple blueprint graph:
http://puu.sh/cuNhv/c8eaea6ed3.png
Changing X will rotate the object’s Z rotation as seen here:
http://puu.sh/cuNeL/4db222ad3e.png
If you construct the transform manually it will work properly such as done on this graph
http://puu.sh/cuOoT/4877dfd18e.png