So everyone who reads this and uses Laguerre, update your .mqh file from this thread!

Thank you, Footon.

Try this .mqh file and report back if you still have this issue.

When you report, then please include your strategy file, it contains the indi with those values, which arise suspicion.

I took a quick glance of the code and I think I know where the problem is.
It is this line:

L0  = (1 - dGamma) * Close[iBar] + dGamma * L0A;

The issue is that it uses the whole data series for value calculation. While in backtesting there can be tens of thousands of bars, in trading there's bare minimum, which in most cases is well below 1000 bars and this explains the discrepancy. The code is not faulty but it behaves differently because it is calculated on different length data sets.

The Laguerre Indicator .cs or .mph obviously still has a faulty code. It generates a signal in the MT4, which is not present in the FSB Pro. I ask for review and correction.

Thank you

THS