problem with secondary subs

[kaboonkal]

well i've been using bsplayer for years now, and lately since almost everything i download is mkv type (720 or 1080p) i've been having trouble with subtitles.
for example one character says something when in the background there is a sign with translation in the subs, it will only show the sign translation.

here is a photo of the problem (and imagine that a character is speaking at the same time):
ImageShack

edit:
when ive tried to use another player (vlc) it showed the subs correctly, as if they were hard subs and not soft (they are embedded in the video i should mention), maybe this is important?

how can i fix this? and also, does anyone have the same problem? im interested...