Trying to combine sub/srt files with video into one MKV file. Remuxed into single MKV with just 3 subtitle tracks, but when I try to play the file, VLC shows 6 tracks in all -- one set of 3 in the order and with the names and languages I set in mkvmerge when I remuxed, and then a duplicate set of the same 3 subs in an unlabeled, random order. But there are really only 3 subtitle tracks. I've never had this problem before. Help please!