I have three romex coming into one arm of the recessed light. 1 from a new recessed light, 1 from switch and 1 from not sure where. I connected all the blacks/whites/grounds to the recessed light but the light doesn't turn off when I flipped the circuit back on.

When I took the existing light out it had two romex going in but funny (or not) thing was one of the reds wasn't hooked up, it was just sitting there, no wire caps and not attached to anything. I tried it once with the red in with the blacks and one without and neither would turn the light off.

The other romex that came from the switch didn't have a red. Light worked fine.

Please advise