>>353652451
Obviously your avatar has certain proportions, right? And these propositions may or may not line up with your own body's proportions. The avatar's waist might be higher than yours, or the length of the calf relative to the thigh might be longer than yours, etc.
So when you calibrate an irl body to an avatar, you have to create a standard by which to proportion things. In vrc, this is by default the arms. Vrc will say "your irl arms are exactly the same length as the avatar's arms" and that will determine in irl terms how long the avatar's legs, torso, etc, are.
With most anime girls, the legs are longer than real humans have (proportionately), so when you do this style of calibration, to make everything match, your irl legs would need to be like 6 inches longer or so. As a result, you float above the ground in vrc, so that your vr feet can be on the vr ground.
The solutions are either to change your models proportions, or to use a different calibration method.
Personally, I prefer calibrating by legs. This makes the legs perfect, but means that my irl arms are longer than my vr arms. But this doesn't bother me.
That style of setting is available with iktweaks