contactTestPair Problem

I found the contactTestPair in panda1.81 return some uncorrect value so that
the line I drawed is uncorrect.It showed had some overflow from output.It’s thankful
if you could have a look at it.I also send the corrent screenshot run in panda1.9 unreleased.

panda1.9.rar (22 KB)
08_Contacts.rar (2.1 KB)