How much different is it? Looking at the screenshots the actual OHLC look identical 95% of the time....especially the High and Low. Not sure about the tick count though.
It is possible that demo and live feeds are different. Not technically a scam, but not always great PR for the broker either. Ideally both live feed and demo feed are identical....most legitimate direct access brokers attempt to make their demo feed mirror their live feed to best showcase their real trading conditions.
Also, you could try having 2 separate terminals (in 2 separate mt4 install folders) and reduce the amount of symbols being tracked in market watch and simultaneous charts open.
Have you tried other brokers (demo vs live)?