There could be multiple reasons why the hopper isn't able to sell a position;
- There is no subscription linked to your account,
- The hopper has done a partial fill instead of the full amount. emove position and resync it
- The position is too small to be traded on the exchange, remove these positions and enable the Wallet Scrubber, merge them with other positions of the same coin, or, when on Binance, select the option to ''pay fees with dust''on Binance itself