I got my Bianca's and love them butttt I hear a slight pop on my left heel. Has ANYBODY ever had this problem? If I stand or walk in them I will hear a pop on the left heel and I can move it and it will pop back. The heel is not loose but this happens. I have not worn them. I wanted to wear them for my graduation next week but now I'm not going to be able to if I send them back. Uggghhh. Do you all think they will break? It does not do this everytime. Should I be concerned? I got them from Neiman's. I tried to research this but could not find any info. Please tell me if this happened to you and nothing happened to the shoe.