I double-checked the amount of colours in your file with the Image Specs Tool and it tells me that not only are there 144 colours in the file, 18 of them are transparent. I don't imagine you intended for such a large palette, or for more than 1 transparency. Perhaps there was a problem during exporting, or you were eyedropping colours and making a lot of redundant/near-similar colours in the process? If you could reupload the file in such a way that it has a more streamline palette, it will likely be approved by a moderator
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I double-checked the amount of colours in your file with the Image Specs Tool and it tells me that not only are there 144 colours in the file, 18 of them are transparent. I don't imagine you intended for such a large palette, or for more than 1 transparency. Perhaps there was a problem during exporting, or you were eyedropping colours and making a lot of redundant/near-similar colours in the process? If you could reupload the file in such a way that it has a more streamline palette, it will likely be approved by a moderator