its because gif's can only have 256 colors total so either leave 1 spot for each extra color you want or use a color that is in the image already.
example you have a picture and you want to have text with the color #FF00FF which is a bright purple. in my example i am assuming #FF00FF is not currently one of the colors in your gif so you make your gif 255 colors leaving 1 color open for #FF00FF when the text is added. i hope that makes sense.
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