Quantum Exams.. why didn't I pass?

Hello all,

I'm on the last lap of my CISSP prep and decided to do some QE practice exams. My first attempt at the CAT took me all the way to 150 questions and a final score of 600. However, on analysing the score graph, my score after 100 questions was over 750. After 115 questions, I was still over 750. At this point, I got a bit disappointed as the test hadn't ended, so I assumed I didn't pass. I skimmed through the last 20 questions which took the graph down to finish at 600.

Here's my question and confusion, why didn't the test end at 100 questions when I was over the 700 mark? The test could have ended anywhere between questions 100 and 120 and I would have passed. More importantly, does the official exam operate similarly where it might not end even if you have a passing score at question no. 100? Reading all the success stories here of people passing at 100 has me confused about this.

Thanks