[amibroker] Strange indicator plot scaling

[Sirbrainfart <sirbrainfart@xxxxxxxxxxx>]

Grateful if someone could help me see where the code below is going funny.
Everything plots fine until you scroll left (or zoom out) to the extreme 
left-hand, i.e. the first bar. When I do this the indicator scaling goes 
AWOL and I just end up with a straight line due to the plot creating 
huge numbers. Can't see why for the life of me...and I don't see the 
problem with indicators that are constructed in a similar way.
Can anyone replicate my problem? Or better still, fix it!
TIA
Andy

//----------------------------------------------------------------//
function StochMom(array, periods, smoothpds, smoothpds2)
{
  mid = ( HHV(H,periods) + LLV(L,periods) )/2 ;
  diff = HHV(H,periods) - LLV(L,periods) ;
  alpha = 2 / (smoothpds+1);
  alpha2 = 2 / (smoothpds2+1);
  X1 = AMA(array-mid, alpha);
  X2 = AMA(X1, alpha2);
  X3 = AMA(diff,alpha);
  X4 = AMA(X3,alpha2)/2;
  return Min(1,(X2/X4))*100 ;
}

Param1 = ParamToggle("Price Field","Close|(H+L)/2",0);
Price = IIf(Param1==0,C,(H+L)/2);

//Stochastics
LongK = StochMom(Price,21,10,3);
LongD = EMA(LongK,4);
ShortK = StochMom(Price,7,3,3);
ShortD = EMA(ShortK,3);

//Colour Arrays
LongColour = IIf(LongK>LongD,colorGreen,colorRed);
ShortColour = IIf(ShortK>ShortD,colorBlue,colorOrange);

PlotOHLC(LongK,LongK,LongD,LongK,"",LongColour,styleCloud);
PlotOHLC(ShortK,ShortK,ShortD,ShortK,"",ShortColour,styleCloud);
Plot(50,"",colorGrey50,styleDashed|styleNoLabel);
Plot(60,"",colorGrey50,styleDashed|styleNoLabel);
Plot(-60,"",colorGrey50,styleDashed|styleNoLabel);
Plot(-50,"",colorGrey50,styleDashed|styleNoLabel);  
//-----------------------------------------------------------------------//


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