Multiple notifications for "notify me when" text messages

I have noticed that I am randomly getting duplicate notifications for 1 trigger.

I confirmed in my log for the device as well as with SmartThings customer service that only 1 sms message was sent out for each trigger.

I’ve also confirmed that I do not have duplicate routing for notifications setup.

The second false text message is usually a few minutes after the original true alert.

Anyone experience this and know what might be causing it?

I’m guessing it is likely my cell carrier.