Q: iBooks Author: How do you get the inset margins applied to the caption text of gallery widgets to preview correctly?

Currently the inset margins I set for caption text in the gallery widget reset to zero when previewed on different iPads. These galleries have multiple images and the captions are set to "individual caption per image" on the widget interaction panel. BUT the inset margins preview correctly if the gallery caption is set to "same caption for all images" in the gallery widget interaction panel. How does one fix this in iBooks Author? Would appreciate any advice or work arounds or suggestions.

Thanks!