Why are some of my texts highlighted blue or yellow in Android N?

[AC Question]

When I open up my conversations on my Galaxy S6 some of the texts are highlighted in two different colors but they are random texts. This really bothers me is there a way I can turn this off or somebody explain what this is

 

[recDNA]

I have always had that in my note 3 as well. No idea why

 

[TJA3500]

Might have something to do with enhanced messaging turned on.