Video problems from some users

I’m testing out Jitsi with the goal of having my nonprofit volunteers to use to communicate with senior citizens in assisted living facilities. I’m able to start a meeting with 2 to 3 users without a problem, but after adding another user I start to see that some of the users’ video are distorted with white horizontal bands. Link to photo: http://conversationstoremember.org/wp-content/uploads/2020/11/PXL_20201122_191156776-scaled.jpg

I can’t be the only person having this issue. Please help.