In theory, a dishonest broker could... but keep in mind they cannot move their prices just for you, they would need to move them for all their clients - therefore it is much harder than most people think (and if you ever catch them doing it, it is very easy to begin trading against them simply by comparing charts with a 2nd broker - sooner or later, prices must return back to "normal").
Typically, the dishonest brokers will take a much simpler approach to cheating their clients - requotes and slippage. I happen to know that FxPro isn't one of these, however, because I trade through them too. And I've seen slippage (when it does occur in fast-moving markets) just as often work to my favor as against me (I close a trade and get more than I expected out of it) - so I know it is just random market forces and not them manipulating anything.
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