No. Leptoquarks were not "spotted" at the LHC.

Some outlets - like PhysicsWorld - produced headlines that to spin this wonky result evidence for leptoquarks - a hypothetical family of bosons that can convert quarks into leptons and visa versa. Aside from lacking the statistical power to claim a discovery, this statement is just downright false.

The experiments as run do not and could not detect new particles, period.

The evidence at LHCb suggests that something is renormalizing the quark to muon decay rate differently than the quark to electron decay rate. The Standard Model predicts that both reactions should occur equally. Meaning quantum corrections are equal for muons and electrons. So any observed deviation is an implicit discovery of new physics, not an explicit discovery of a particle.

The aforementioned lepton universality violations are quantum in nature. They don't happen explicitly. The effect of leptoquarks - or whatever new physics there might be - is more subtle. The quantum mechanics of the new physics has the collective effect of adjusting the physics parameters - like electrical charge, mass, and yes, decay rates - as things like energy scale.