No-one's suggesting there are alternate speeds for this song, one twice as fast as the other! It's just about how you count it. One-two-three-four-One-two-three-four or One-and-Two-and-Three-and-Four-and. Both sound the same.
This is the type of situation where just listening to the song really helps. Use the sheet music to guide which notes your supposed to play, but if there's ambiguity in the sheet then just listen and decide what sounds right.
I listened to the Spotify version of the song, and tapped along using this online BPM calculator: