I did notice that when I pressed the launch button while in continuous mode for the first time, there seems to be two means appear on the histogram before it settles into a cadence. In the video below, focus your attention on the histogram to see what I mean:
In https://github.com/phetsims/projectile-data-lab/issues/91#issuecomment-1912783800 @catherinecarter said:
https://github.com/phetsims/projectile-data-lab/assets/109630002/06d7132d-6aad-439c-a42a-447cbc9d5800