Is it normal for friends to get into conflicts sometimes?

Before going to the question, I will first tell you a story as an “opening” for the topic.

I have mentioned in one of my thread that I used to have a group of friends. We were very close, always talking and laughing together, and giving each other helping hands. Well, that was before a certain training, when we were forced to stay with each other 24/7. Two of them (let’s call them A and B) began to give me the cold shoulder (well, after some incidents). After some time of trying to talk to them without success, I asked for help from the rest of the group. They told me A and B just hadn’t recovered from the incidents with me, and it’s quite normal. They said conflicts and arguments happened sometimes, among all members of the group. Even A and B fought each other sometimes…

I listened to them and waited, but still the situation didn’t look up. I thought that the friends I talked to about my problem had already sensed A and B’s exclusion of me and they only tried to calm me down.

But there are still some recent incidents happening to me that prove they are right. I have seen (and have been among) some friends who have very bad arguments with each other then make up. Someone told me conflicts are just normal part of friendship. But I’m not sure.

I’m not going to ask for any advice on the above-mentioned story. I only want to ask “Is it normal for friends to get into conflicts sometimes?”