Made all the instructions mentioned above and lost 85% of my MTNC that was in the wallet long before. Currently, it shows only coins, that I`ve got for the March and April 2018(((
What I`ve done wrong and how I can restore my MTNC?

Thanks for helping in advance.

P.S. In the History column all old transactions are mentioned but only that not minted are green and in the balances they are not visible(((