Why are you'll so surprised? Everyone's 1st week sales have declined over the past year or so, Ariana went from selling 400k+ first week with her lead single in 2014 to barely selling 100k+ with her following lead singles. Taylor, Adele, and other will suffer the same fate, sales aren't as powerful as they used to be.
Dayum.
daily reminder that being a britney stan isn't cool or practical anymore 