The Devs of XZC decided not to cooperate anymore and go their own, separate ways.
The coin has a 'founders reward' on every block which is paid to the devs. In poramins new version Gary's address was removed and replaced by a new address, however, there was no official statement or whatever.
Bittrex has the original version (pre-fork) listed and it is yet undecided what happens after the fork.
Gary's version has poramins founder reward address removed.
Which version of the coin do you want to mine after the fork? Be aware that bittrex has to use the same fork in order to be available for withdrawals of the pool. It might be they simply halt trading at all of the coin and desist it after the fork.
The devs don't comment or communicate on that issue currently and the slack is very toxic, so I couldn't get any info anywhere I simply let the miners decide.
Please vote which version you want to mine.
Also have a look here :
https://bitcointalk.org/index.php?topic=1638450.msg17289355#msg17289355Pool is at :
https://xzc.suprnova.cc