Hello, Meghan,
Please describe the “products disappearing” problem in more detail with screenshots and URLs.
After that provide correct wp-admin and FTP access (please check them before replaying).
You can use Lightshot screenshot or Gyazo tool to make screenshots and share the links here, or you can use a file-sharing service such as WeTransfer https://wetransfer.com/ to upload ready images there and provide us with URLs.
Kind Regards,
8theme team