Hi Ben,
I understand that you have seen some user accounts within Atlassian Cloud that appear to have changed in their account ID number. In this particular case, I would recommend creating a technical support case with us. That way we can gather the proper ids, email addresses, etc so that we can better understand the behavior here.
I can see that your account has the ability to do this, you can do this by going to https://support.atlassian.com/contact I recommend creating a technical support ticket and choose one of your supported products, Jira Software, Jira Service Management, etc. Our support team will want to get specific examples from you and sharing email addresses within Community probably isn't an ideal means to gather the data we need to investigate here.
I would welcome you to share the results of any support ticket here in community, in case others have observed the same behavior. It might help to share our experiences here.
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