Agreeing with others here I believe the issue is with Zoom. A comment in the below linked thread recommended using headphones to resolve the issue. I understand its not a permanent fix but could be a short term work around.
Link: https://community.spiceworks.com/topic/2261510-laptop-audio-problem-hp-pro-book
I followed all of the instructions on the link above and so did a colleague of mine and we have not had issues presently. Have not needed to resort to headphones.