Newbie Question

I have just starting trading at two sites FXCM and IBFX with their MT4 platform. I noticed that the same moving averages and indicator numbers on my charts at both sites are different and not even close. Is there a reason for this or is one sites software better and more reliable than the other.
Thanks.

yes may be, if the sites have been designed and developed in other platforms and packages, this may happen, or there are chances of some errors in the coding also!