The fill tool isn't filling the whole area

I was practicing isometric art and this happened.

I’ve noticed that the gaps look exactly like or very similar to things I’ve selected, copied, and pasted. I don’t know how to stop this.

Do you have many layers or just one?

Yes, I had a second layer because I got tired of having to repaint the empty spaces after erasing.

There may be almost transparent pixels there. Try hide background to see content over checkerboard.

Also do you know that erasing with black is not the same as erasing with Eraser?

You may just attach your file here for us to check it.

Turns out there was some transparent pixels, thanks for the help.

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