Changing display name causing dups?

We have a custom built Smartsheet solution. When it was built the person's full name was used in various places in the solution, used in formula's and automations. What we have discovered now that we are using the solution, is when a person goes in and updates their display name in their settings, from Robert to Bob or adds/removes a middle initial, the system no longer recognizes they are the same person, even though the email address never changes. This is now causing problems, as we see Robert and Bob in a row or report, and have to adjust our reports to account for both names - this is hard to do as we don't know who changed their name and to what. Has anyone else had this problem, and if so, what did you do to solve?

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