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The game can be 'hacked' @Fu5tia, but what you are seeing is not the result of a hacker. The high weekly score is caused by King merging the accounts of players that have multiple accounts. It is plain from the number of complaints caused by this issue that King do not care about the effect of their actions. You can try contacting Player Support, but I very much doubt they will give you a satisfactory response.
I always thought it was due to hackers or cheaters too. I only signed out of one account and into another when they had a partial merge. I'm so glad they didn't completely merge or I would have lost everything, in every king game I play with that account.
@Alienscar I'm so tempted to sign into my phone with that account and see if it's still on level 15171 or my current tablet level 5196. There's no way I'm going to risk losing all my gold and boosters though.😂