You definitely don`t understand what is "random". But randomness says that whatever has the same probability to happen, then it will eventually happen if there are many repetitions of this event. Imagine how many millions of hands happen every single day.
What is "strange behavior"? One out coming in the river? Well, if the card is in the deck, it has the same probability of any other card. What is strange about that? It is rare, but how rare? Chance is 2%. What is two percent? 1 in 50 times it will happen. If you play 50 hands like that, expect to get beat by 1 out on the river at least once. What is strange about that? 50 isn`t a high number.
For me, strange behavior would be the same card being dealt two times, for example.