Its because you are in the mobile version of the game. In the mobile version, the battle stars are determined based on 3 particular in-battle missions. Since you have premium, you got 4 stars which means you did not finish one of the mini missions in question. So you got 4 stars instead of 6 whereas, the player below you got 6 stars.

The special battle modes are lit! They really do bring a balance in gold hunting. And I think the discounts should be a bit more like 35-40% given that its 'Iron Days'.

Do I have to find both kind of 'ares' or just one of them? ??