Can Teeth Chattering Be Bad?

[winniethepooh]

I have looked up lots of articles and heard from lots of videos and people that teeth chattering is not bad but today while I was having floortime with the piggies, they started teeth chattering at each other and following each other around and while teeth chattering, they flinched or moved around each other quickly (don't know how to explain it, hopefully you guys understand what I'm trying to say).
Can it be a bad thing? Also, sometimes it happens when they are in an area that is too small but the area I put them in is big.
They also jumped at each other, is this bad too?
Thanks for help, Jake, Winnie and their cavy slave.

 

[Delitedcavy]

Sounds like there fighting to be the boss to me

 

[piggieminder]

Dominance Behaviours In Guinea Pigs
You may find this thread useful.
Sounds like your piggies are having a bit of normal dominance behaviour. My guinea pigs teeth chatter at each other occasionally it's a warning to back off I'm not in the mood for you right now. They also teeth chatter at me at feeding time if I don't bring their food to them quickly enough!