I use jforex 2.4.2 with demo account.
I get some ticks from history for an instrument like EUR/USD by using history.getTicks() or history.getLastTick() command.
Then I get some other ticks using onTick() event.
When I compare the results there is a big difference: the bid and ask volumes for ticks that got using onTick() is one million times bigger that the results obtained using history commands.
There is a sample:

Result obtained from onTick() event:
time:2009-11-11 13:49:44.295
bid:1.5019 bid-Volume:11000000
ask:1.502 ask-Volume:20800000

Result obtained using history.getLastTick() command:
time:2009-11-11 13:49:44.295
bid:1.5019 bid-Volume:11
ask:1.502 ask-Volume:20.8

As you see bid and ask prices match exactly but bid and ask volumes differe greatly.
I think this is a bug.