Strange Occurrences in Twisted Treelines?

So, I was playing 3v3 (I hardly ever play 3v3, this was my second time), and I noticed some really strange things about the people I was playing with. First, everyone picked exactly the same champions on both teams. Fiora, Renekton, and Ziggs. This is blind pick so the chances of that happening are pretty low. When I got into the game, I found that no one responded to chat, and no one bought items off spawn. At first, Fiora on the enemy team and Renekton on my team started rushing towers and getting killed, before minion spawn. The enemy renekton kept heading into the bush between the first two towers, and the ziggs played pretty normally. However, when he got his ult, he seemed to almost "shut down". He just started standing in place, killing minions with his ultimate and his abilities. Towards the end of the game, with me getting a ton of kills and getting fed, they all started actually attacking. The ziggs on my team, however, started feeding the towers for no reason. They also bought really strange things. The ally renekton bought 5 longswords and then a brutalizer, and the enemy fiora bought wicked hatchet and banshee's veil. When the game ended, they all instantly left. I heard that they have bots in 3v3 sometimes, but this just didn't seem like bots. They fed sometimes, they bought items, and they were all around very strange. What is this? Screenshot as proof.