December 3rd, 2019: Our team is aware of a problem that causes some video blocks to play sound even when muted. Our team is investigating the issue so that we can find a solution quickly.
In the meantime, if you encounter a muted video clip that plays audio after you produce your video, you can readjust the volume on the clip by following these steps:
1. Clear your cache
2. Un-mute the video block
3. Mute the video block again