Video quality as a panelist vs. as an audience member

We did a test of our Webinar prior to it going live. In the test, panelists were able to see the video of the presentation nice and crisp and high quality. But, as an audience viewer, I saw it low quality and very pixelated. We ran a test where I was also a panelist and the video appeared in high quality just like the other panelists. It was not a buffering/computer issue. It clearly showed a difference as an audience member versus a panelist. What is the issue and how do we fix it?