Your eyes are correct. It is true that the ramp switch moves.
However, it does not mean that the underside is not fixed.
As instructed in part 3 245, it is fixed on two technic bricks(32064).
In part 3 246 and 314, these bricks appear to result from their movement because they are connected to the bucket shift timer of part 3 314.
Your original module is different from that of the instruction. I can not see the ramp switch in your original module.
It would be better to remove the ramp switch and fix the ramp independently to other bricks.
https://bricksafe.com/pages/ajhstyle/ball-factory-v