Figured bass score not displaying correctly on musescore.com

generalbas ovn 1.mscx I have problems with my figured bass score. I typed the numbers using the MuseScore figured bass font, and everything looks fine in my score when open in MuseScore, but after I have uploaded the score to musescore.com, the numbers (or rather some of them, not all) are replaced by nonsense text. What could be the source to this problem? I tried viewing the score in different browsers, but that didn't seem to make any difference.