Thank you for reaching out to the Community! If you are only seeing one contact in the bounce report, but there should be more, it's most likely you are looking at a specific bounce category instead of all bounces. You can change the view by clicking the down arrow in the Display section. Here is an example below, and you would click where it says "Recommended for removal" and change it to "All Bounces."
Please also let us know if there is anything else we can do for you. Thank you and enjoy your weekend!
You are very welcome. I am happy to see these steps assisted you with finding the rest of your bounces. Please let us know if there is anything else we can assist with.