Audio Stuttering in WMM

Hello. I have encountered an issue many times with WMM. One example of the Audio Stuttering can be heard here: ( https://www.youtube.com/watch?v=g38BiUHPmTA ) most prominently beginning at 1:16. I use Audacity as my DAW.

The original project file in Audacity does not have the stuttering, nor does the output MP3 from Audacity of the file. Within WMM, playing the video as a project file with the audio as well does not induce the stuttering. The first file in the chain that the stuttering happens in is the output WMM MP4 file.

The output settings I used for that video in WMM are: Width 1280, Length 720, Bit Rate 8k, Frame Rate 29.97, Audio 192kbps, 44.1khz, stereo. I presume that the only setting that would apply to the audio is the kbps, sample rate, and channel distribution.

On Audacity, I have matched the kbps and sample rate exactly- 192kbps constant, 44.1khz. The audio is dual mono. I have tried other bitrates as well, no luck. I normalize the final track in Audacity to -1db. I have tried -3db to see if possibly WMM was clipping the track upon output- and no, at -3db it still stutters.

Any suggestions on what might be causing the stuttering? Should I have the kbps and sample rate set differently?