there are 100 ways for them to get bruised.  did you whack them on a counter to get the cakes out of hte jar?  that'll bruise them.  did you hold them a bit too tightly when you did your verm roll?  that'll bruise them.  did they bump into each other a bit while you were doing your 24 hour dunk?  that'll bruise them.

cakes can bruise very easy, just a fact of life...

ps