The friendly "Name via Smartsheet" is randomly changing

Haven't had this problem in the 7 months of using Smartsheet, but now the automated alerts are randomly changing from me as the owner of the sheet to other users. Instead of an alert coming from "Deanna Layton via Smartsheet", they are randomly coming from other members of my team. Help! I can't even find where to change the "from" address... so don't know where it is picking up various names.