Volibear Bug

I was playing Captain Volibear skin, so I dont know if this was a skin problem or champion problem. But every now and then when I went to auto attack my jungle camps, there would be no audio for the attack. I would just hear a *slap* *slap* *slap* *silence* every now and then. It doesnt affect gameplay much, but it is still kind of weird to play with. Thanks.
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