Why do my sent text messages duplicate LG V30+?

[Android Central Question]

LG V30+ all my sent text messages are duplicated

 

[B. Diddy]

Welcome to Android Central! Do the message recipients tell you that they're getting duplicate messages from you, or does it only look like they're duplicated on your phone? Are you using the stock messaging app, or do you also have a 3rd party SMS app (like Facebook Messenger) installed?

 

[Tim1954]

I've had this occur across many devices and software versions, which makes me suspect it's a network issue...