Why are some of the texts that I received are showing double messages?

[AC Question]

The text repeats itself twice within the one text message that sent.

 

[Javier P]

Can you see a pattern on those duplicated messages? Same person, carrier or phone?

 

[nanapull3]

I am having the exact same issue after marshmallow update on my Samsung AT&T Note 4. Text is sent once but a second text is sent to the same person at the same time. Does not happen every time a text is sent but happens enough to be annoying. Any solutions? Done the cache clear. Hoping to avoid another reset. TIA