Its definitely the new discs. The buttons seem to have quite a lot of clearance and rotate freely. I can actually slightly rotate the outer portion of the discs by hand due to the amount of free play in the fixing buttons. I have emailed the supplier and Brembo to ask if this amount of movement is normal.
FZS 1000 Gen1 (2003)
Tiger 900 GT Pro (2020)
Tiger 900 GT Pro (2020)