Hi @Ehab_Ayman, thank you for reporting, this indeed is a bug. It will be fixed within the next DeepAR SDK release. As a temporary workaround could you try to duplicate the material used on the other shoe to make sure that the shoes use different materials from each-other.
Reason why this bug happens is because the DeepAR SDK caches model normal matrices per material basis instead of per node basis. This is easily fixable and we will get right on it.
Thank you so much for helping us make DeepAR SDK and Studio better.