Great but some problems – Spiral Tower Review

I love this game I got it last week and since I've completed 49/51 missions but it should be 51 because I've unlocked all my cubes but it's stuck at 97% I have over 3000 gems so buying the theoretically last cube is very manageable and even then all my cubes are no longer black so I don't know why it wont let me collect my 20 gems and let me earn the "complete all missions" mission also !! Please fix this
Review by A / GG on Spiral Tower.