Yes, it’s a Fill Rule issue. Explanation for how to work around it is here:
No, you know what Todd, I’m not sure that’s right…you did say it’s a PNG and that’s raster not vector…my bad.
You might need to just clear the artifacts out of the PNG in Photoshop. A quick way to find them is to assign a stroke to everything temporarily…they will just jump out and you can then erase them.
