Why does the image look like that, with so many black squares?

Hello, I have just joined the forum.
I am a game developer and, for a game I am making, I created an image. I converted the word file to jpg, scaled the image to 320 x 244 pixels and converted it to gif. That image in the game has many black squares.
I would like to know why they come out and how I can remove them.
Thank you in advance.

This is the image that you see out of the game.
Acknowledgements

This is the image that you see in the game.
bor.pak - 0000

Maybe start to look at the different answers of your post you did yesterday on Pixls.us over there > Why does the image look like that, with so many black squares? - GIMP - discuss.pixls.us before to copy-paste it here?

Ok. Being two forums I thought to write the same post to all two to have more answers.

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