Hi Shosiu,
Our tech team confirmed the results are expected. They tested ROG STRIX B660-I GAMING WIFI and TUF GAMING B660M-PLUS WIFI motherboards and the results are the same. The points are getting lower with voltage offset(undervolting), as CPU performance will be affected by voltage.
Also, CPU clock is an indictor of performance, but cannot fully represent CPU performance.
Thank you.