Piggies bar bite for a multitude of reasons - sometimes you can stop it, sometimes you can’t , sometimes they do it just for attention.
Did you out in entirely new fresh bedding into the new cage or did you use some of, soiled old bedding from their previous cage?
It’s recommended you use old, soiled bedding in a new cage as it will help them settle into their new space more easily. The old bedding will obviously smell of them and they will feel reassured that it is still their space.
If you used entirely new bedding, then your piggies may be feeling overwhelmed and unsure.
A new cage will mean they need to reestablish their relationship and hierarchy in the new space so you may see an increase in dominance.