Refiring too quickly will crack/break/ screwup pieces.
You've got too much heat too quickly and the fired piece can't relieve the stress the heat puts on the piece. There is a temp range between 900-1200 deg f that the glaze.glass and the claybody go through quarts inversion. This is the critical temp but there are other temps lower to consider.
Wide plates & uneven temp will also bust'em up
Long and slow 200 deg/hr to 900 deg then 100 deg/hr till 1200 then back t0o 200deg/ hr to end for refires and still you may loose some.
You don't know how the bisk was made or fired so there might also be issues there as well.
Chalk it up to learning.