We started the war on 21/25 and won. I noticed the chest started glowing, even though it was still on 21/25. I opened the chest and got rewards, the chest still remained on 21/25. I restarted the game, still on 21/25.
I think it is a visual bug, but it might be possible to open it again after next war (if we win).
Its visual bug and happens most of the time for me. Just restart game and ull have 1 point 
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