Nothing funny has happened after installing electron wallet but since the dev is not open about who they are then i wouldnt keep anything in electron wallet after you claim your bitcoin cash.  I sent my bitcoin cash to viabtc.

you will need to contact bittrex about the bitcoin cash

the master seed or master key you get from electron wallet is only good for electron wallet.  once you empty the wallet and transfer bitcoin or bitcoin cash to another wallet or exchange that master seed private key is only for electron wallet.  just dont use electron wallet again and all is good