Strange Voice happenings

Sunday evening we had 7 players and myself (DM) on Roll 20 for The Dungeon of the Mad Mage, this is the first time we've had 7 players (we used to have 5 players). All were using Chrome, and all had their set up correct. However while all people could be heard, they could not be heard by everyone: 3 people could be heard by each other but no one else, and 4 people could be heard by each other and no one else, I however could hear 5 people but not that other 2 (who were being heard by others) I have no clue what to do, we ended up using Discord for Voice, but I'd really prefer using Roll 20 for Voice. Any ideas?

Hi Mike, Please have those that are experiencing issues carefully work through to the first three steps of our guide to Solving Technical Issues: Step 1: Make sure to use the right browser             - Please check if these issues persist when using both Chrome and Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20             - Please disable all add-ons/extensions. Step 3: Clear cache Please refer to our Video and Voice Chat wiki as well since multiple players are experiencing issues with being heard.  If the above steps have already been completed or do not resolve the issue, please work through step 4 of our  Solving Technical Issues  wiki and provide us with the information listed. Please be sure to include a  WebRTC Debug Log as well if possible.