Minor animation mismatch
The animation for the shapes being launched from a belt launcher is take more time on the belt launchers next to the vortex than the ones from 1 structure.
In video 1 we can see the shape progress further after the two acceleration wheels before getting an actual acceleration.
When everywhere else it's properly accelerated at the moment the shape touch the acceleration wheels. (You can see an example on the "Tips & Tricks" -> "More Vortex Inputs"), example in video 2
For reference, my belts are currently at lvl 3. But i could reproduce the exact same behaviour in god mode in a brand new save
Video 1: