Man, notifications on youtube are REALLY behind tonight. I mean, I'm getting them, but not until a couple hours after a video has already gone out on a channel I watch. @TeamYoutube you really need to get those fixed!
We'll need to look into this further, send the video URL and screenshots our way. Also, any chance you have a YouTube Channel URL for one of your subs who didn't get the notification? A specific example would be really helpful to investigate. Let us know!