Does anyone know why does purepool ratio behave strangely? It should show 'Amount of your shares required until a block was found in average', but if you look at this one for example (and there are many more) https://pool.purepool.org/main/miner/BS8B8E1tgT3jgtvtLZ6f7hWi9s5sxbohLU/ , it shows value of 11k, but this miner never broke 11k shares in one day, so it can't possible have 11k shares per block found.