Your SS, ISO, and aperture are all over the place.
Were you in Program mode or something?
With the consistent lighting that you have and shooting what you are shooting;
either set it up for manual mode by locking in SS (about 1/1000), set the aperture for about 4.0 and
use your ISO to center that little needle in the middle of the viewfinder while using center weighted metering.
Or use AV or TV mode, again with center weighted metering and ISO at 100.
Check your images often in the viewfinder often and make corrections as needed.
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