I've seen something similar happening on my friends list, names not appearing when you scroll down and the list then popping up eventually, so wouldn't be surprised if it is just a technical glitch with the new PS4 software.
Hopefully Sony will iron out the glitches with an update in the new year!
#10060072, By Rodderz PlayStation 4
Rodderz 2,776 posts
Seen 45 minutes ago
Registered 10 years ago