Problem with mkv subtitles...please help >.<

[Chibi]

Greetings...I have an annoying problem with subtitles on mkv, i was hoping you could help me. (and sorry for my bad english XD)
When I watch a mkv file and two people speak at the same time, bsplayer shows me only one of the subtitles. In normal programs they show a subtitle on top of the screen and another on the bottom (like in anime openings: there is the karaoke on top and the translation on the bottom), but with bsplayer it shows me only the subtitle that should be on the top, and it shows me that on the bottom. I don't know what to do, because many times there are shows with persons speaking at the same time, and bsplayer just shows me one of them.
I hope someone can help me :\ i use bsplayer pro version 2.35 build 986