Blade scratching the container

Hello there, ice cream enthusiasts! I have been using the creami for about 6 months months and have noticed with recent uses that the sides of the container has become scratched up (mostly shallow scratches that I can barely feel with my fingernail). I am sure they are from the blade mixing the ice cream because of their shape and the fact we don't use anything abrasive when washing the containers

Is this normal? I leave the ice creams to defrost for 20 minutes before mixing and I use warm water to warm up the sides of the container to prevent any ice creams from sticking to it. Has it happened to you as well and is there any way to prevent it? Thanks in advance :)