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There is a lot strange calculating, not just yours.
Would be interesting how these % figures were created.

ah I think they took the new HP and divided it with the whole HP..

3749 / 4821 = 0,7776

This is a very unusual way to show growth in % when I calculate the final result to be 100%, however you are first, congratulations.

Yeah, I guess they just want to stress how much has changed to the total HP^^

The final results will be released in a few days as I've understood it..