The premine balance was locked before the commencement of 5000% POS stake. Yesterday, on 11th of November we had to send some amount to the exchange, so that we may sell the premine amount to the new investors, who are not mining this coin, for distributed and mutual share of POS stake reward for all. At the moment, we started the wallet of premine to send that amount to exchange, mistakenly we didn't disable the staking before powering on the wallet, and within couple of minutes, the premine staked around 798888 MUT. On realization the wallet was stopped immediately. You can verify that this staked amount was sent in only 2 minutes.
This will not happen again, as the premine wallet will be started with staking off in the conf file. And, the staked amount of 798888 MUT, will be burned tomorrow.
Nice to see you explaining the issue. I sincerely hope that it was just an accidental error. All the best for future.