Being Penalized on GRE mock

Hello all,

I just took a mock GRE test. In verbal, I got 9/20 in the first section and got medium difficulty questions in the second section: scored 10/10. But my final score is 146/170.

In quants, I got 17/20 in the first section and got hard difficulty questions in the second section: scored 161/170.

It would be great if anyone can explain why the scores are not 149/170 in verbal and 163/170 in quants. Where am I penalized and what for?

Thanks in advance.