I got 100% from my war against my opponent Kiao Hard (Clan: War Push). The 3 stars was reflected below but I never got it as when the result was shown, the three stars never got highlighted.
It is a pity that I won and the stars never got add in to the clan war results.
I got 100% but the stars never got highlighted and thus equal to no stars earned. This is a software glitch which Supercell will need to address.