Normal for the price of a power tool and a hand tool
Once again you got what you paid for. The chisel is of poor quality, so I had to disassemble and regrind it before using it (see picture). After that it works perfectly and makes nice corners.
Pros
MAKE YOUR INSIDE CORNERS: Use this corner chisel to quickly, easily and accurately hollow out the corners of mortise hinges. Ideal for cases where your router creates a perfect groove but leaves a "rounded" corner.