Buy when cross ma15 and reverse if end bar not wif same direction

I wanna make it Buy when High cross the ma15
and when the bar end , if the C>ma15 then do nth, if C<ma15 then reverse at next bar open
Short also same case when the ma15 cross L, then short
and when the bar end, if the C<ma15 then do nth, if C>ma15 then reverse at next bar open

I try to make it by the following code but the result is out of my expectation as in the pic
Any suggestion

aaaa

Plot( C, "Close", ParamColor("Color", colorDefault ), styleNoTitle | ParamStyle("Style") | GetPriceStyle() ); 
ma15=MA(C,100);
Plot(ma15,"",colorWhite,styleLine);

Buy=Cross(H,ma15) OR Ref(C,-1)>ma15;
Sell = Cross(ma15,L) OR Ref(C,-1)<ma15;
Short= Cross(ma15,L) OR Ref(C,-1)<ma15;
Cover=Cross(H,ma15) OR Ref(C,-1)>ma15;



Buy=ExRem(Buy,Sell);
Sell=ExRem(Sell,Buy);	
Short=ExRem(Short,Cover);
Cover=ExRem(Cover,Short);



PlotShapes(IIf(Short, shapedownarrow, shapeNone),Colorwhite, 0,H, Offset=-63);  
PlotShapes(IIf(Cover, shapehollowuptriangle, shapeNone),Colorwhite, 0,L, Offset=-45);  

PlotShapes(IIf(Buy, shapeuparrow, shapeNone),Colorwhite, 0,L, Offset=-45);  
PlotShapes(IIf(Sell, shapehollowdowntriangle, shapeNone),Colorwhite, 0,H, Offset=-63);  

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