Recessed Lighting: Wiring Puzzle--How is this Possible

[UrbanFarmEngineer]

TL;DR Summary

Recessed Lights on ONE Switch
Switch is basic ON/OFF, no dimmer nothing fancy.:
SWITCH goes ON: One light OFF rest of lights ON
SWITCH goes OFF: Light that was OFF now ON rest of lights on but dim.

Hey Everyone

OK This is BOGGLING my mind. How is it even possible? I am trying to figure it out before I look in the Jboxes of the lights.
Any ideas?

Newly installed recessed lights done by skilled electrician.
One switch controls all lights.






SWITCH goes ON: One light off rest of lights ON

SWITCH goes OFF: The light that was off goes ON and the rest go on but are dim.

Also is anyone has a really good wiring diagram for recessed lights, please share!

 

[UrbanFarmEngineer]

Switch is basic ON/OFF, no dimmer nothing fancy.

 

[Baluncore]

The lights have individual intelligence and cycle in brightness when momentarily switched off and on again. One light is faulty and does not reset to synchronous operation.

To test, swap a good and a bad. If the problem moves, replace that light.

 

[berkeman]

Thread closed temporarily for Mentor review...