I agree with the others that you should make sure you set your camera on manual if you did not before. Also I set my background to 1/2 f/stop over my subject not a full stop. But I do measure independantly and then set the exposure to the combination of all three lights. Because light is additive. And depending on the location of the lights and model you may be getting some spill from your background lights onto the model.
My two pennys anyway.
Alan Dyck
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