Centered tracks don't play through default Stereo Out using headphones

I’m running Cubase 12 Pro on macOS (MBP M3 Max laptop). All tracks play as expected through the built-in speakers on the device. However, when I plugin headphones, only tracks that are not fully centered can be heard.

In the case of a drum set recorded, the bass drum and snare drum batter/resonant side is centered. If I slide these over just a bit to either right or left in the audio spectrum I can hear them via headphones. Also, the further I get from “center”, the loud the track is.

What would the problem be?

Thanks in advance.

My guess is that the headphones are not plugged all the way in. Could you try with a different pair?