this happens frequently when you jump and use a vertical attack, I find it happens more if you move the camera down while striking.

https://gyazo.com/ded59f5b6d3c1aa09fabdeea6220c116

Thanks for the report. The hit detection is a bit off for the power attack. The run forward and jump deal. I'll file a bug for it since your link shows what should be a direct hit. I've run into it myself so it may as well be time for a proper file on it.

-Cheers