I have done some data collections and comparisons after taking GMAT Prep tests more than 10 times. Depending on how many OG books have you gone through (OG 12, 11, V/Q supplements 1&2), I've experienced approximately +10% repeat in each of the two sections for every retake. Neither reinstalling nor resetting the exams can help you avoid seeing repeats.
Many users and experts have recommended to idle for full 2 mins when you see a repeat during a practice exam. However, this approach has its drawback: on a practice exam with many repeats, 40%+ in each of the sections (which you will reach at the 3rd retake of a particular test), these little 2-minute waits add up significantly and serve as mini-breaks during the exam. As a result, you don't experience the full mental demand that would be required the real test. However, if practice is the goal, I believe it's better to power through the repeats and work on the new questions. You might consider noting your time after you finish the last problem in each section so you can evaluate later in conjunction with the repeat % to determine if you took a reasonable amount of time to finish the section.