Well the keycap from massdrop was suppose to be OEM profile, but Vortex mixed up the order and made Cherry profile instead.
As far as I know all the Cherry replica are made from the same place as imsto's keycaps, and imsto's keycaps are well known for being loose.
So as far as I know, only cherry profile PBT that's made in China will be loose, if you have OEM profile PBT chances are you'll be fine.
In your case then yes it will be loose and it's normal.