As you are used to, I double-checked what was my idea about those shadows: being simply a slightly moved duplicate of the original shape with the color, alpha and other settings you setup in the PI, Shadow accordion. I published to HTML5 and everything showed up as expected, here is a screenshot of that published version:
For the first smart shape I only decremented the Alpha more for the Fill in order to see better the duplicate, shadow image. The second one has no fill, but I customized the shadow color.
Could you post a screenshot of your different result?