Max framerate ignoring settings

In previous versions I ran anywhere from 120-150 Fps on max setting but a week ago I couldn't pass 60fps however, I would stay exactly at 60 fps at all time never going lower or higher. My max fps is set at unlimited but it is acting like it is at 60. But today it got worse now it is locked at 30fps and after restarting the game it went down to 20. I checked every time and my max Fps is set at unlimited and I have tried changing it to just a high number it still does not work. I am sorry I do not know how to reproduce this bug.