I've heard some people complain that some of those endcaps aren't a perfect fit with all lights, and sometimes you really have to jam them on there to get a good contact...?

I didn't see anything obvious on your video, but that model is also supposed to have a "system disable" feature to prevent you from accidentally turning it on when you don't want to. Sometimes there's another on/off switch or you have to spin a knob or something. I think I've got one stashed on a gun in the safe - if you don't figure it out, I can try to go take a look and see.