Mundos cleaver not showing up.

For the first 10 minutes of the game, I could see Mundos cleaver just fine when he would throw it. Randomly about the time he hit 6 or so, the thrown cleaver would be invisible. His character model would make the regular animation and the noise on hit is the same. I know for sure I'm not blind. I can't say if this is just my client, or if it was happening for just that one match as I haven't played against Mundo much today. No one else in my game seemed to notice, just thought I'd mention it in case anyone else had this same problem. It's not game breaking or anything, just a little bit harder to dodge.