This is truly disappointing. How is it possible to have been on a wrong chain since the beginning of the year or even earlier? This is a joke. If this is true this coin is a joke and I have wasted money and time. I have left my computer running for over half a year for... nothing. All my stakes are gone - tens of thousands of coins.
But I suspect that this story is even worse than that. Some weeks ago I have sent some coins to Cryptopia and they HAVE arrived there - so we were on the same chain. How comes my staked coins NOW are not on the same chain of Cryptopia any more while they were on the same chain a few weeks ago? This is impossible if I was on a different chain. It looks like a hard fork has been just done now by the dev which has wiped out all my staked coins. Otherwise, how would they disappear?
Have you tried to use earlier blockchain file, like this one - MTNC Blockchain data source 2018 03 21 - sync again, than use repairwallet command?