SYA got 52 weeks. WM went after 51 weeks, but SYA got to 52 weeks. The video of this week's Hot 100 also shows 52 weeks. Maybe they got SYA and WM from a few weeks back confused. I copied and pasted this from last week's Hot 100.
2W LW TW Title -- Artist(s) Peak Wks
44 45 49 See You Again -- Wiz Khalifa Featuring Charlie Puth 1 52
Actually most of the songs are shown with a week less than they should be. Lean On had 48 weeks, Antidote had 26 weeks, Perfect had 20 weeks, History had 6 weeks, Save That Money had 19 weeks, and Walking On A Dream had 5 weeks. Only the one-week songs are right.