Garmin Venu 3 counting steps while bench pressing

Hi, I just got Garmin Venu 3. Tonight was my first training session in the gym. I started strength training but without counting reps, so just to keep a track of approx. calories and time.
I noticed when I was lying on the bench, and doing bench press with barbell that garmin is counting that also as a steps. I did 4 sets of 12 repetitions, and I got around 80 extra steps even though I was lying on the bench.