Hi April,
Happy to help!
It looks like there's a possibility that the issue you're experiencing is isolated to the videos that you are creating using Camtasia. To verify if this is the case, try re-encoding your video using a tool called Handbrake to see if this helps correct the audio issues. Here's where you can download Handbrake, and this video contains instructions on how to use the tool to re-encode videos.
If the issue persists, would you be willing to share a copy of your project file here or in private by opening a support case so we can take a closer look at what's happening? We'll delete it when we're done testing!
