Looks like the shape is not closed, so it’s treating it as a line. Lines are different—it basically only allows you to make a single pass.
I can’t see if there’s a way to close the path within Easel, but whatever program created the original path should be able to close it for you.
Edit: I found a hack to close the path. Add a shape that you know is inside the one that’s open, it doesn’t matter what it looks like (a box or circle is fine). Then select both of them, right click, and select Combine. This will make a new shape that is now closed.