It’s a new setting in the game! Click on the settings while in candy crush like where you turn the music on and off, and there’s now an option to turn the vibrations on and off for the game only.
Mine just started the same weird vibration tonight. I don’t want to turn off vibrations on my phone as suggested because that turns it off for phone calls, alerts, and messages as well. Why did the game start vibrating all of a sudden?