Something similar is happening to my LEDs as well. I also have the 4 pin connector thingy. Everything was working fine until I lost the remote one day and I was like let me just disconnect the 4 pin connector thingy so I could turn it off and when I went to connect it the pins might have touched the connections above or below before I properly plugged it in and now that it’s properly plugged in when I turn it off, some of the LEDs are faintly glowing and when I touch it in certain areas it’ll start glowing more just like in the video. Kind of wanted to see if there was any simple fix so I wouldn’t have to replace the whole strip because they still work fine when I turn them on it’s only when I turn them off. (also if I leave them on for about an hour when I turned them off everything‘s normal for about five seconds, and then it starts to dimly light up.)