When your controlling ATC at any airport on PG, when you scroll across the screen, and while your scrolling and you click on one of your jobs (Ground/Tower, Center, Departure and Approach) the camera literally follows the pattern you scrolled the viewing screen (tower).
How to reproduce:
Try making a figure-8 pattern (or any pattern) on the ATC camera view (on PG) and while doing so, click on one of your jobs (Ground, Tower, etc.)