That is another thing about Chinese knock-offs. There is nearly zero QC. I’ve noticed this in the remote sensing camera market as well. They have high-end features, very good picture quality, low cost but a short lifespan and one guy can get a really good one and the next a lemon. I’m guessing the cast on my anvils were just ratty and overlooked. I’ve only heard of a few folks complain about the same minor issue I was having with slightly damaged cambium.