Online trading technology is not perfect and in rare cases, the feed can be disrupted.
This may only last for a moment, but when it does, prices can often become affected.
While it may be tempting to place an “arbitrage transaction”, keep in mind that in such situations, the prices do not reflect the true market price and your actual fill may be many pips away from the displayed price.
In the event that trades are executed at prices not actually offered by iFOREX, iFOREX reserves the right to reverse such trades as they are not considered valid trades.
Keep in mind that these instances are usually rare, and by not trading during these moments, traders can avoid the risk associated with the above scenarios.