It's normal. That one has a wet clutch and constant tension CVT. When you come to a 'quick stop' the belt doesn't get a chance to reset all the way to the top of the secondary clutch and as that clutch is spring loaded, the belt stops somewhere lower than where it should be at full reduction. When you lock the back end up the secondary sheave stops turning and the belt stays where it is partway down the secondary sheaves.
But there's nothing to prevent the primary clutch from opening all the way and it does, so the belt gets a bit of slack in it, which it shouldn't really have. This means next time you take off from a standing start the centrifugal clutch will make the front clutch start to whirl around until the weights throw out and the clutch slams shut and grabs the belt. That's why it chirps and lurches. Belt Bark, it's called. Same reason a plane's tires chirp when it comes in to land. You've make your CVT into a belt slamming Polaris!
It's harmless. It'll do the same thing if you come to a halt with some throttle on, like if you are plowing snow and ram into a snow bank. Chirp next time you move.
You can make it not chirp after one of those locked up stops, by putting it in neutral and giving it one quick rev to reset the CVT. Or not, it doesn't hurt anything, that's just why it chirps.
