We appreciate that you spend your time finding bugs and recording steps to reproduce them. Unfortunately there can be some delays with our reaction due to the busy schedule.
The bug happened when you used multiple tabs to play Balls game or Dice game (in past). Server Seed Hash was saved to the Cookies and each time you pressed Randomize or Play button in the first tab it took effect for another tab(s). That's why new Server Seed was automatically generated and changed in the second tab, because it has been used in the first tab.

Anyway, it's fixed now. Sorry for the inconvenience.