As many modder before me have already noted, the skin does have some issue. Aside from that, there is also that because you skinned the hit circles, but didn't skin other parts of the hitcircle like numbers, approach circles, etc., it is highly recommended that you skin them as well. If you really don't want to, then at least set the default skin as the standard. You can get this option like this:
Song Setup > Storyboarding
It is underneath skinning, just simply choose Default.
Also, for your hitcircle.png, try to crop it into a circle, because right now, a little bit of that actually is outside of the hitcircle overlay.
I also think the offset is late. XD XD
It sounds more like 8,380 than 8,390.
Anyway, I didn't notice anything wrong than those things, so here is a star for now. :3