Mouse kept moving

So I recently downloaded mazeyflyff in my new laptop. Runs really good, you know. But whenever I start a client in mazey flyff, it runs ok too. But the mouse kept moving out of the client window for some reason so I can't really do anything with the mouse kept moving out of the window. I've even redownloaded the game but still happening.
I Would greatly appreciate any help I can get from solving this problem.
Thank you.

Is it a wired mouse or the pad?
If it's a pad try putting something underneath like a book or so, some surfaces don't like mice .-.