Hi everyone. I have problems with Grades in Engagement studios:  I am using the rule, if GRADE is higher than C go to path 1 otherwise go to path 2. However, I have prospects with C- going to path 1. 

I tried to do a change and set the rule: Grade Between A+ and C, go to path 1. However the same problem happens. Why is this? Does anyone have the same problem and have a good solution?

It seems Pardot order the grades like the following: 

C+

C-

C 

Thanks in advance for the help!