Thank you for your lovely comment sugarpixy, I think I’m just going to have to put this one down as a mystery !!!
There was nothing heavy on top of the cake just a little butterfly which can be seen in the photo, I never use frozen cake only fresh baked, and have always refrigerated the cake before covering with no problems, think this ones got everyone baffled, thank you all for your time replying to me I really do appreciate all your help :) xx
Deborah, Nottinghamshire