It isn't a problem... it is the way it is.
Your in camera meter wants to expose what it reads as 18% grey... if you meter for the white back drop the meter thinks it is grey and everything else is underexposed.
When you switch to spot meter you can just meter for the face ( which to the meter is approx 18% grey) and the exposure is closer to being right.
Your choices are:
Meter for the background and adjust your exposure by a stop to 1 1/2 stop. Spot meter on the face, or use a handheld light meter and expose for the model.
grs
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