I have the exact same question. Saw the "ST" note added and looked it up today. Hopefully it's just a liquidity fix as noted. NRG/BTC has pretty much stalled out the last few days and luckily ETH pair is looking better.

I'm a fan of KuCoin but recently they lost a TX of NRG and I'm still waiting on a response from their support team; ticket was opened on 26th of January. Hopefully I get that TX before things potentially take a turn for the worst.