messaging to 1 person but it sends as a group message

[Yevgeniy Zhikharev]

I was group messaging on my LG V20 and later when I text to one particular person - it sends it as a group message. I've noticed that when I enter that person name i see that next to a name there is an Icon ( shape of a bust) suggesting that it will be Group message. Did other person somehow LOCKED the group on its phone?
And even if i deleted the group conversation and deleted all the participants - it is still comes back as a group message