A little problem with photoshop

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Tri|Ga|De

I cant seem to get it to work right anymore.

I want to fill a selected area with the color black, but it fills the area with a gradien from black to transparent.

I create a new image and selects it all. Then I set a border of 5 px on the selection and invert it twice. Now I have a 5 px thick selection all around my image. It is this selection I try to fill with solid black.

If I fill all of yhe image (without selections) it fills it with solid black.

start image
end image

I don't know how to fix it so it will be a solid black filling.

Anyone know what could be my problem?