Flow Calibartion and dropping Filament

Hi recently got my Bambulab X1C, often when i run the Flow calibration i got some filament dripping out of the extruder on the Flow test. I use original Bambu PLA with AMS. Is this normal? Do i have to run that flow test everytime i start a print ? Prints are very good … just have the problems with the Flow calibaration…

I only run flow calibration when I switch filament brands or types.