Hi @Befuddled2, let's see what we can find about this!
When you say that you shared a Dropbox account, do you mean that you all shared an individual account, and used the same credentials to sign in or something different?
Could you clarify the OS on your new MacBook, along with the app's version, and syncing status at the moment?
Also, if you follow your account online, are you able to see the changes there?
Let me know more!