Auto Populate Useremail

I have an app form that has a field named “Inspector” This field auto-populates based on the user email who is signed into the app. However, this data can be edited to add a “Date of Re-Inspection” at a later date. However, if this form is resubmitted by a different person the inspector field changes. Is there a way to stop this from happening?

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If you have placed the expression USEREMAIL() in the App formula part of the “Inspector” column, please shift it to the initial value setting of the column and make the column uneditable.