MP4to DVD audio rendering problem

My friend and I are making the final file of our movie on to a DVD (it's on a mp4 right now)

My friend noticed that different audio comes out from two different speakers
for example the dialogue comes out of the right, and the added in music/sound effects and such come out the left.

Now, when I rendered the file into an MP4 the audio for the dialogue was a sample rate 96 and a bit depth 24
but, all the added in sounds were rendered as 48/24

my plan is to take the MP4 audio and put it in sound forage and render/save the audio as 48/24, then, go into Vegas and strip the old audio and swap it with the sound forage audio and then render another MP4 and have a better sounding one.

that's the only thing I can think of. but also should it be rendered out in stereo or mono?
 
So I re rendered the whole movie's audio in sound forge at 48/16 mono and it sounds good.
the all sounds came out of both speakers.I tried the stereo but I was having the same problem.
 
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