K's Probe problem

Im using k’s probe version 1.1.28, the problem is the lower chart c2/po chart sticks at 5 i cant change this so when im scanning some dvds and there is a higher than 5 error it will not show on the chart and i want to keep chart picture records that are tidy, ive tried uninstalling and reinstalling it but it still sticks at 5 it was working fine b4, i know you can zoom in and zoom out but it wont go back to normal please help! i know i can still see the error rates but i want it to be neat as i want to keep proper records on the dvds!