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When a relay is turned off, the magnetic field in the relay coil collapses and the collapsing field passing through nearby wires induces a small current in them. If your relays are mounted right next to each other, they may be cascading down as each is inducing a current in the other. Being mounted near the wire feeding the neutral light would excite it. Mine were mounted vertically, one on each side outboard of the headlights and induced current in the turn signal wires. The turn indicator dash lights would flash when the high beams are turned on or off. Based on other reports of the indicator lights flashing, I'd guess others commonly did the same thing.