How do you rotate the camera?/which template do you use (or have you created your system from scratch)?
Make sure to take a look at this thread: https://answers.unrealengine/questions/35476/limit-viewrotation.html 
How do you rotate the camera?/which template do you use (or have you created your system from scratch)?
Make sure to take a look at this thread: https://answers.unrealengine/questions/35476/limit-viewrotation.html