Why my blocking is so low

From stats my blocking seem to be really well, but the overall % since 6.0 is really low with the 5%, does anyone have a idea how i could improve?

https://preview.redd.it/8mcpsu628cke1.png?width=1238&format=png&auto=webp&s=7f859ab0305e46ac7e4eb0f4f58aea6679dbb682