This thread topic is a perfect example of why it is SO IMPORTANT to double and triple check invitation lists, bid lists and preference/priority ranking cards! We had a similar issue this year (which I won't elaborate on to keep confidentiality), which initially looked like a computer error but in the end was human error and could have been avoided if those involved had checked the lists. It turned out great in the end, but if no one had said something about it, the issue would have never been resolved.
I think that in using any type of computer program (ICS, CampusDirector, CAR, etc.) that it is both the chapter and Panhellenic's responsibility to check and double check that the data entered is correct. I love that ICS and CampusDirector put the accountability on the chapter for entering information correctly, but in the end, it should always be checked more than once for accuracy. Human error can lead to a compromise in the program.
(p.s.- sorry if this came of as a rant at all... I'm still a little bent about the aforementioned situation was handled on my campus. But it's all good in the end
)