Topic moved as is not a CBSubs support topic. Please understand your subscription includes support for CBSubs only.
Regarding your issue what information is being replaced? All fields? Just name, username, email address? If it's just Joomla fields then it's probably a 3rd party Joomla system or user extension acting on the before or after Joomla user load events. Could also be a 3rd party CB plugin acting on CB user load triggers. Disable non-core Joomla user and system plugins 1 by 1 until issue goes away. If it doesn't repeat with non-core CB plugins. Aside from that I don't see how this is possible beyond browser autocomplete.