Please provide recipe and Technique so you can get some help as members would be guessing what çould have happened. Please also Introduce yourself in the Introduction forum as you are new and this is your first post.
Piping didn't adhere to the loaf. (Of course) How old was loaf? Before adding top?? Did you wipe loaf with a wet cloth? Before piping. Were loaf and piping from same recipe? Inquiring minds want to know. Looks like you ran it thru a slab cutter.