Caption to an image with shadow

[Budfudder]

If I have an image with a shadow and try to add a caption, the space for the caption gets created fine - but Captor draws a black border, the width of the shadow, around the image. If there's now shadow, all works fine. But when there's a shadow, the shadow gets drawn over in black.

Is this a setting I'm missing?

[mouser]

Can you show me the two screenshots comparing the results and point out what shouldn't be there?