Large black subtitles appearing in ISO playback

Hi,
ISO playback on Mac or WIndows using VLC produces clean white subs. iPad playback on Infuse Pro 5.5.1 produces a “bold face” black sub superimposed onto the normal white sub. You can see the white text as a shadow of the thicker black text. I’ve tried changing the color but it has no effect on the black text, only changes the underlying font.
Any suggestions?
Thanks

Sorry about that.

Would you be willing to upload a sample file which we could review here?

Upload completed.
Thanks for the quick response.

Thanks! We’ll take a look and work to get that fixed up.