The Twitch/Flash is from the camera looking down at the ball during the initial flight. You can see how the ball starts from the bottom of the screen rather than from the point of impact, causing this issue for you.
- Check the room config. You can even take the config from another good bay and use the settings from it on the bay with issues.
- Check the ball camera settings and compare a good bay to this bay that is having the issue.
Matching good settings and moving those settings to this bay should solve the problem for you.