Yobit is an exchange to avoid. But your problem isn't even that.
You probably put your sell orders higher than market price, and since the volume is low for bitcoin gold, there is a high likelihood that your sell order will not go through until the market value of the coin rises significantly. This is how the orderbook works. You can't just list any price you want on a sell order and expect it to go through instantaneously. There has to be a 'taker' for the trade to go through.
Cancel the trade and redo your trade @ market bid price if you want an instant trade.