I have my settings set to only friends can view my story, but a user named "snapsntat2s" keeps viewing it too. When I go to add or search for the user it says they do not exist. How's that possible or what's going on?
Open Snapchat, then press the settings wheel in the upper right. Scroll down and select View My Story > My Friends. This setting will force the viewing permissions to only friends. Unfortunately, there is no information about the mentioned user. Try adding it to the block list to prevent any other disturbance regarding your user and the stories you publish.
For additional information, visit the official support page related to this query: https://support.snapchat.com/a/privacy-settings