I recently got a new drawing tablet (Monoprice Graphics Tablet) and i set up everything perfectly fine. However, i opened photoshop cs6 and when i draw, there would be an extra line. when i draw a semi circle, it automatically completes the gap with a straight line when i lift the pen up or stop drawing and it's really bothering me.
Here is a gif that i made to demonstrate what i mean: (click if it doesn't move)
also...my lines appear to be sort of jittery or non-smooth. even my mouse looks smoother than when i use my pen..