my motion sensor light won't go on when I turn the indoor switch on? what is wrong?

I thought my bulbs were burned out so I just bought and installed new bulbs for one set of my two sets of outdoor motion sensor lights.
I put the switch on from inside, and one set of lights went on but the other set didn't.
I have two sets of two motion sensor lights hooked up to the same inside switch
As I said, I put the switch on from inside the house and one of the set of lights outside went on fine as it has been but the other set still didn't go on even though new bulbs were just put in today.
The set that didn't go on was the set that have the new bulbs in it.
Is there something I need to joggle, or switch or know about on the outside unit that is holding the two new bulbs.
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