This happends when the subtitle you have doesn't match the same framerate as the video file (for example, the subtitle is for 25 fps and the video file is at 23,976 fps). To resolve this problem, the best thing is to download a subtitle for the same framerate as the video file or to convert it to the desired framerate. For example, when you open a video file, on the skin, BSplayer will tell you the resolution of the video file and the framerate:
720x480 @ 25
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