Streaming Audio Sounds Like Darth Vader

Using Wirecast to push to Restream.Io for Facebook Live and YouTube Live. Our workfow has worked fine for several months. However, during our most-recent stream (August 15, 2019), the audio sounded like it was at about 10% speed. Here's a link to our recent YouTube Live: https://www.youtube.com/watch?v=nay7ze9MYeM&pbjreload=10

Audio from previous stream (August 13, 2019) sounded fine: https://www.youtube.com/watch?v=4xgar07v62M&pbjreload=10

We are using Wirecast 12.2. Audio/Video fed from our audio console/video production switcher to our Mac: High Sierra 10.13.