This looks like the GIF transparency animation effects "restore the previous content" and "keep the current content" got mixed up.
BTW, GIF does not support 60 fps, it handles only multiples of 1/100 s. So the closest valid speed would be 2/100 s/f = 50 fps.
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Apart from that, there are better palette quantizer and optimizer applications for converting full color content to animated GIFs out there. Here you got discrete colors already, that's not your issue.
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