It happens..I was with a group all 56-59 and 35K + Brs a couple of days ago. We drew one set of opponents several times that 1 shotted us...we never got a single attack.
Same day we got a couple of opponents we single shotted.
So there are still issues with the matching system.
Also, the start button is still not selecting properly. I have had time I had to hit it up to 6 times to get a lock or had it drop after about 3-5 sec of countdown.
I have seen level 59 players with 52k BR while I was in BattleGround. If you have 2-3 players with the same BR, they will without a doubt 1 hit your entire team of 35k BR. With the help of Talents consuming exp, people are able to stay at 59 and continue growing in strength without growing in level.
At the same time, I myself have had times where I went against parties that 2 hit my whole team. At the time I thought they were extreme cashers who stopped leveling at lv 59, but after reading this, I'm starting to understand what happened. I'm a lvl 59 sitting at 44-48k BR.