G'day Achilles28,
MetaTrader version 3.xx uses (bid+ask)/2 as the FX 'price'. Then they place +2 and -2 on that as well. So the chart will never have a true bull candle or a true bear candle. Take a look at any MT3 chart and you will see what I mean. There is always a 'shadow' on every candle.
Their new
MT4 doesn't do that. It has the bid price as the chart price and true bull/bear candles will now appear when they occur.
I have used MT3 for a couple of years and the discrepancy is a minor one in my view. At the moment I use MT 3 and 4. The MT4 is still being updated almost daily but it is a really good package.
MT3 is available still form Alpari and some other brokers I believe.
Hope this helps a bit and
Good trading to all...................