Because that's the way it was built. My Sony cybershot does the same.
Most cameras are designed that way, this enables you to do selective focusing, for example when you are taking a portrait the camera may focus on background instead of the person, by placing the small round or square you see in viewfinder , on the person face press the shutter half way, this lock focus , keeping the shutter pressed you can recompose the image , and take the shot , this enable you to take a sharp portrait, with a blurred background
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