Hello, Today after the arena ranking period closed it looks like my points reset to the tier minimum.  In my case 2900 points for Gold 4.  Last night I was comfortably between 3000-3100 points and not worried about dropping to Gold 3.  However, this morning I got a Gold4 chest but when I went back to the arena, my tier was now Gold 3.  Checking the battle log, there were 3 defense battles for 26 points.  My current score was 2874 which means I was at 2900 points before these three defense battles.

Am I missing something in the rules or is this a bug?

Below you can see my score in the morning and the battle log.

Thanks for checking this out.