Are you running sselphs scraper manually like in the YouTube video or are you running it from within the setup script?
I am following the video step for step
Also are you refreshing emulationstation after you scrape the games?
I am rebooting the Raspberry PI after I scrape the games
Also which version of retropie are you on?
I should be running the newest version. I downloaded the image 2 days ago and 1 day ago followed a video in updating it.