Steem Dollars & Steem wallets Disabled on Poloniex.com.. Why this happend? due to difference in prices on Bittrex and poloniex?

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You can clearly see that #Steem dollars and #STEEM wallets are disabled on poloniex.. Why this happend? what will be its effect on the value of #STEEM and #STEEM Dollars ? STEEMERS please guide us in this regard...

Is it really due to price difference on Poloniex and Bittrex?

Thanks..