Incorrect altitudes being imported

Hi,

I created a flight from EGGW to EHAM and set the altitude in Simbrief flight planner to 9000 ft. The PDF shows 9,000 ft however when I import it into the Beechcraft Baron G58 Garmin - it shows 23000 ft for flight (except for the descent ) .

I can change the altitude in the Garmin but going through all the way points is tiresome. Is there quicker way to set the altitude to my desired altitude?

Kind regards,

Paddy