Thank you for your suggestion! I also noticed that, but since this is just a basic animated version of what I wanted to create as a png for this contest I don't want to focus on that too much. I also kind of disliked the color/texture of the coin itself and changed it in the meantime.

Maybe if enough people ask for it, I'll make a gif out of the updated version of that logo.
We'll see that, when I have created a post about that issue.

Anyway, have a nice day and thank you so much for your feedback!