Problems editing smartphone clips. Audio seems robotic after saving in movie maker
Check your original &amp; edited video file, right click on it, check for details. 

The problem is maybe movie maker software already accidently reduced your audio kHz... Or your video original speed is 24 fps, you save it as 30 fps maybe (this wrong setting will appear double outlines). (These mistakes are very common happened around beginners.)

Try to use save as, select save movie/project as, .mp4 or h264, rename it, this setting will not reduce your video too much, you can publish it on youtube too, just a bit longer the time taken, some use save for High Definition for publish video on youtube.



Umm... I figured out now, issue is about Web reduced your Audio KHz, you need to correctly set Video &amp; Audio Export setting for Web. .mp4 (H264) is the best format for web included Video and Audio. Set it to Published for Web or Youtube. 

More technically, is Software "Recommended for This Project Editing Feature" auto-removed your Audio's noise, after noise removed, audio will become robotic. And, something is low spec.

Youtube Auto-edit is really awesome for People, but only who studied Video &amp; Audio Editing know what the problem was and editing it, fix it. I really answered all issue why Audio like these, you won't understand it because it need to manual editing. I can't edit it for you here, I'm apologized. You can find Online Video Editing Service Designers edit for you. I just can answer why it happened.