Slow Stochastics varies?

I have been using GFT Dealbook demo account for the last few months and have based a trading plan with their system. Actually paper tested a system with Dealbook for sometime. However I have recently opened up a live account with MB Trading, but I still use GFT dealbook, untill recently they are giving me the boot. So I thought no biggie I took a look at IBFX charts, and notice that the Stochastic Osc. can not be duplicated with GFT Dealbooks Slow Stochastic Osc. Even when I enter in the exact same settings, the RSI and MACD both line up, of course I know the price feeds are off by a pip or too, but both those indicators are pretty much identical. So I loaded up FXCM and noticed the same thing, FXCM's slow stochastics renders a completely different reading then GFT's.

So my question is this, can GFT's slow stochastics be mirrored like RSI/MACD on any other broker's platform? Has anyone else experienced this difference in readings?

Most brokers charts using indicators are going to slightly differ from others. Don't give yourself a headache by using different charts and platforms. Just find a way to use one to prevent confusion.

Good Luck