So, what if "being two places at once" is really just the endpoints of two waves in opposite harmonic resonance. If that resonant frequency (also means frequency of the carrier wave) was in the visible light spectrum, then it would 'appear' like one photon at every node, then at the antinode, it would appear as two. If you watched it head on, it would look like a photon splitting and fusing really fast. Apply the other dimension, and boom. Two particles 'being in the same place' suddenly are endpoints of 2 waves in opposite harmonic resonance.

Since the collider is a circle... It can only create events (waves) based on 2d circular math... that is why it appears that way but that isnt whats happening (the roof kills the wave, so since not even one cycle can propagate, it can only show an instance of the wave [i.e. two particles merging into one]). We need a 3d collider.