After Lamp Blew and Circuit Breaker Popped Light Won't Go Out
They're new LEDs.
An ordinary switch turns power totally on and off. However, many special types of switches, often (but not always) including:

Dimmers
Smart Switches
Motion Sensors
Photo Sensors (a.k.a. dawn/dusk)
Timers

need to have power flowing through constantly in order to power their electronics. There are a few different ways to do this:

Batteries - easy, always works, but means changing batteries every year or two, which is something people forget to do.
Leak current through the circuit - Easy to design, but very much not compatible with LEDs. Typically results in LEDs blinking or dim.
Neutral to complete the circuit - this is, IMHO, the best solution. Except that if you don't have neutral in the box then it doesn't work. Which is why neutral is now required in new installations in most switch boxes.
Ground - this is permitted if designed appropriately and very low current used.

Most likely if you swap the sensor switch for a simple switch, everything will work correctly. If you really need (or want) the sensor, then look for one that:

Requires ground to function. This will be described in the installation instructions.
Requires neutral, provided you have neutral available.
Specifically claims &quot;LED compatible&quot;. That should mean that it doesn't leak current through the circuit when off.

This problem does not happen with incandescent bulbs, which is likely why you did not have a problem previously.