/cgl/ - Cosplay & EGL

high heels question.
These are the heels i am using
they are exactly my shoe size (EU 39), they feel fitting, but if i walk for a few moments they feel like they are slipping.
issue is mostly solved by wearing thick or multiple layers of socks.

My heel feels like it is too far infront of the shoe heel, but when i check my heel is bumped right against the back of the shoe.
Is this how it's supposed to be? am i missing something? i am walking like how the tutorials say, on the outside it looks great and nothing is being damaged, atleast i think, feels very wrong to shift all my weight onto one heel. Any tips, could the heel simply be damaged? there's no noticable difference between left and right so idk, would be crazy if they are both damaged in the same subtle way.