differences between chart price and trading price

Hi all!
I'm a newbie so please excuse my ignorance, but is it usual for a broker to display one price on their charts and another on their trading platform - i'm currently demoing acm and have found that often the price on the chart will change, but no change will occur on the trading platform for some time.
Thanks!

Charts are either bid, ask or a midpoint between both...Check what prices are displayed on the chart....Most market makers & brokers use the bid price in creating their charts....Some others allow you to choose which price to draw the chart with, and others, like InterbankFX use the midpoint between the bid and ask....


Thanks,

Nader

Some brokers also use a different feed source for there charts compared to their trade station.