Usually it's due to animated tiles included, or the colour palette is wrong (use the purple button on the far right to highlight pixels that don't match), or your screenshot is the wrong resolution (640x512 instead of 320x256 etc), or you have scanlines through it, or you have found the wrong set of tiles, or the tiles you have selected is missing either the start or the end... Loads of possibilities! A save state + config file is by far the easiest way for us to help you!
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