Time differences between UK and US charts

[Pawnless Endgame]

I've been looking at Wiki's one-hit wonders list of the 1990s for United States. Yes, while a few had more than 1 hit in the UK, I'm surprised to see so many songs that are outside of their own year in comparison to the UK charts. My main era was 1994/5/6, so I'm looking at:

- Ini Kamoze, Here Comes The Hotstepper.. 1994, should be 1995
- Corona, The Rhythm of the Night.. 1995, should be 1994
- 2 Unlimited, Get Ready for this.. 1995 wtf that should be 1991!
- The Luniz, I got 5 on it.. 1995, should be 1996
- Everything but the Girl, Missing.. 1996, should be 1995

...and so on.

Did this really happen?

 

[Pawnless Endgame]

Emotionally, I tend to put the songs in the years that I heard them, so I found it strange to see that the US chart was a year out on some of them. I just wondered if the US chart really was slightly out from ours, knowing that Wikipedia isn't always accurate.

 

[Pawnless Endgame]

Call me naive - I didn't realise that's how it worked.