PVP Opponents

Platform, device version and operating system:
Xbox One
Screenshot or image:

What you were expecting to happen, and what actually happened:
Was expecting more variety than just 3 opponents. Normally it is narrow with about 10 in the pool, but last night I had to fight the same 3 opponents for a out 90 mins. Tried restarting the game, but it never changed. The other issue was when checking the battle log it only showed me fighting each of them 1x each. Even though I played for about 90 mins straight. It also showed a ton of defense losses in the log, but I wasn’t notified of any defense battles ever happening with wins/losses and items gained

How often does this happen? When did it begin happening?
Although every day the opponent pool is small in PVP. Last night it was exactly 3 the entire time I played

Steps to make it happen again
Play Ranked PVP