So, say you were to put two particles in a superposition together, but they have a very specific interaction.
basically, if one is x, the other will be y, and vice versa, which is something that quantum physics allows.
However, because their states are not determined when they are put into a superposition, they are only determined at the point of interaction, this causes something of a conundrum.
It turns out that when you observe one particle, the other particle will be the opposing one, makes sense, but this works at any distance.
This implies that somehow when one particle is interacted with, not only does it collapse into one of the positions, but somehow it is able to influence the other in some way to ensure it collapses into the opposing position when it is interacted with.
and this happens instantly, no matter the distance between the particles, which shouldn't be possible.