Toggle Visibility going on but not off?

I’m have trouble with my Lightning strike Blueprint. When the lightning flash hits, its comes on but stays on,
I pretty much copied this Lightning strike Blueprint posted by anonymous | blueprintUE | PasteBin For Unreal Engine 4

when you have 2 toggle visibility do they turn off and turn on depending on what state the light is in if its on or off?

everything else works but that flash stays on?