please fix you upgrade system.
it happens to me many times like pna upgrade 90% success but i failed 3 times straight c'mon thats 90% success rate why would i failed 3 times straight.
also costume upgrade to 3star this is the most painfull it happens to me 4 times on my chars, tina/violet/yuri/wolf gang.
each of that chars experience costume upgrade to 3star failed 3 to 4 times straight failed c'mon eme its a 75% success why i would failed 3 to 4 times straight. that was 300 to 400 greater phase fiber wasted and it is not easy to earn it is kinda annoying it is ok if that happens to me once but i experience it for the fourthtime.