Trade Responsibly. Trade Responsibly.CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 84.60% of retail investor accounts lose money when trading CFDs with this provider. You should consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your money.
FxPro Help Centre - Glossary

Slippage

Slippage is the pip-difference between the price a trader expects an order to be filled at and the price it is actually filled at. Slippage tends to occur when liquidity is low or in volatile markets, particularly in the run-up to important economic data releases. Slippage also affects stop orders as these are executed as market orders which are automatically filled at the next best price rather than re-quoting another price to the trader.