Usually, requote problem will often be faced with Dealing desk broker because when trader asks on the price but in the listing broker is unavailable then will appear notification to offer with the new price, if then you click ok, might will not get the price like as you expected before, but is non-dealing desk broker usually not happen because they will forward the order directly to a liquidity provider. I use STP FXOpen and never get requote except delay because the server busy or low speed connection