I don't think it's a connection issue. I think if you upvote something and then again upvote something within a second, I mean quickly, this might happen. Maybe because the previous upvote is happening.
This might seem to be a dumb one.
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Answer 28 - It is not a complete entry, if you watch my video in the comments section, I can make the arrow spin any time I like so it is not a problem with speed. (you edited your comment, so even if it was right, you would not have qualified.)