Faced same issue with GMAT mock 1, 3 and 4. (I haven't attempted Mock 2)
My observation is that whenever there is an internet connection issue, OR test taker pauses the exam, the question numbering seems to reset for some reason.
I faced this issue in verbal today. I came across an RC with 4 minutes on the timer and messed up question numbering. I ended up guessing all of the RC questions, thinking that I might see some SC or CR questions at the end (I did not

.)
Not sure if this affects the scoring of the mock in any way. It would be great if someone can provide some insight into this issue.
Also, Can this issue repeat on actual exam as well?