you're supposed to reset the tire setting after adding air to the tires or when putting in new tires otherwise the sensors go off...
so what you experienced was normal...
07 650i Cabrio CPO, Titanium Silver
Black Matte Grill
Dark Birch Wood Interior and Shifter
HUD, Cold Weather and Sports Package
Logic 7 Sound
Aluminum Racing Pedals
K&N Air Filters
Rays Master Piece REM 20" Forged wheels w/ Conti Extreme DWS