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 Rodriguez PlayStation 4
Rodriguez 1,100 posts
Seen 9 hours ago
Registered 8 years ago