I had not heard that the CCSP went to CAT, however maybe @AndreaMoore can provide insight into this.
@MattDH
https://www.isc2.org/Frequently-Asked-Questions#accordion-29bc23be1a3a4eb296321631a61650e0
This page should help address your questions.
When taking an (ISC)² exam, can I skip a question and then go back to answer it?
What is Computer Adaptive Testing (CAT) and what exams use that test style?
Thanks for the detailed note and understood. I expected that I was able to skip questions and return them later as the official study book told me so. I had the CCSP exam yesterday, and I realized that it's impossible to skip&return questions and finally did not pass the exam - that was my fault. Do you have any plans to change this rule?