Any existing pending order(s) (i.e. Stop Loss, Take Profit, Entry Stop or Entry Limit) placed on an instrument will be adjusted to symmetrically (point-for-point) reflect the price differences between the expiring contract and the new contract on rollover date, at 21:00 GMT.

To reflect the new Future contracts, the automatic rollover will include a charge equivalent to the spread of the CFD. This effectively aligns to the cost that you would have incurred if your CFD position would have been closed on the expiration date and you would open a new CFD position based on the new Futures contract. The spread charge will form part of the adjustment already being performed to reflect the price difference between the expiring Future contract and the new Future contract.

Customers holding positions open at 21:00 GMT on rollover date will be adjusted for the difference in price between the expiring contract and the new contract through a swap charge or credit which will be processed at 21:00 GMT, on their balance.
If the new contract trades at a higher price than the expiring contract, long position (buy) will be charged negative rollover adjustment and short position (sell) will be charged positive rollover adjustment.

If the new contract trades at a lower price than the expiring contract, long position (buy) will be charged positive rollover adjustment and short position (sell) will be charged negative rollover adjustment
 

You can avoid CFD rollover by closing your open position before the rollover date.