Bittrex is definitely not on the same chain that I am.
I'm not saying which one is the right one or the wrong one. But it seems to me, the one continuing at 1 block per minute is likely the proper chain. And that isn't the one Bittrex is on.
I'm at block 837040 too.
There was a post a page or two back about Bleutrade's wallet being encrypted and therefore not staking; would the same not apply to Bittrex? Either way, chalk up another quirk of the PoST transition!! lol