Both cameras are on matrix. Her camera is metering darker than mind side by side test

Everything is identical. No exposure set at all. I went into setting & turned my brightness down in Stardard & Vivid to -1 & helped my camera a little

Nikon D7100 with 18-200 lens Noticed during a trip to the mountains a lot of my photos where way too bright. My wife has the same camera & lens that I have. And our cameras are setup identical & her pictures where a lot better than mind. We where shooting in aperture priority. Got home & did test side by side & notice her camera is metering darker than mind. Do I need to send in for repair or make some kinda ajustment?