Incomplete iqfeed data

I have some problems with IQFeed data. In the charts in Amibroker and in IQFeed Time & Sales all data are available. But if I want to access on these data in backtest and in explore-mode some data are available and some not. In settings "wait for backfill" is active.
An explore of the code for example 14.04.2020 shows this (attachment "IQ_Feed_Explore"). The data for ARCT are not completely (like many other). But in the chart all data are available.

The problem must be in my amibroker code or settings. Does anybody have an idea ?
The Code below is only a test program to isolate the problem
Thanks for any help.
Frank

TimeFrameSet( inDaily ); //compress

SetOption( "initialequity", 30000 ); // Startkapital     
SetOption("MaxOpenPositions",4); //Maximale Offenen positionen   
SetOption("MaxOpenLong",0);   
SetOption("MaxOpenShort",4);   
SetOption("SeparateLongShortRank",TRUE); 
SetOption("AllowSameBarExit",TRUE); 
SetTradeDelays( 0, 0, 0, 0 );


Short_daily = Ref(C,-1)>1 AND Ref(C,-1)*Ref(V,-1)>500*1000*2;

Short_daily_explore = Ref(C,-1)>1 AND Ref(C,-1)*Ref(V,-1)>500*1000*2;

Open_daily = Ref(O,-1);

DayClose_daily = Close;
HighMinus1_daily = Ref(H,-1);
LowMinus1_daily = Ref(L,-1);
CloseMinus0_daily = Ref(C,-0);
CloseMinus1_daily = Ref(C,-1);
CloseMinus2_daily = Ref(C,-2);
CloseMinus3_daily = Ref(C,-3);
CloseMinus4_daily = Ref(C,-4);

Timestamp_daily = TimeNum();

TimeFrameRestore(); // restore time frame to original 

Short_tmp = TimeFrameExpand(Short_daily, inDaily);
Short_daily_explore_tmp = TimeFrameExpand(Short_daily_explore, inDaily);
Open_tmp = TimeFrameExpand(Open_daily, inDaily);
DayClose = TimeFrameExpand(DayClose_daily, inDaily);
HighMinus1 = TimeFrameExpand(HighMinus1_daily, inDaily);
LowMinus1 = TimeFrameExpand(LowMinus1_daily, inDaily);
CloseMinus0 = TimeFrameExpand(CloseMinus0_daily, inDaily);
CloseMinus1 = TimeFrameExpand(CloseMinus1_daily, inDaily);
CloseMinus2 = TimeFrameExpand(CloseMinus2_daily, inDaily);
CloseMinus3 = TimeFrameExpand(CloseMinus3_daily, inDaily);
CloseMinus4 = TimeFrameExpand(CloseMinus4_daily, inDaily);

Short = Short_tmp AND Hour()<10 AND Minute()<40;// AND TimeNum()<=93100;

 
Cover = 0;
TakeProfit = IIf(Hour()>10 AND Low*1.01<ShortPrice*0.9,1,0);

Cover = TakeProfit OR Hour()>14;

Timestamp_hourly = TimeNum();


PositionScore = Ref(C,-0);


score_rsi_explore = 100-Ref(RSI(14),-0);

PositionSize = -15;

Filter = Short_daily_explore_tmp AND Hour()>14 AND Minute()>25;
//Filter = Short;
//Filter = 1;

AddColumn(Ref(C,-1),"Ref(C,-1)");
AddColumn(PositionScore,"PositionScore");
AddColumn(score_rsi_explore,"Score_Explore");  

AddColumn(CloseMinus0,"CloseMinus0");
AddColumn(CloseMinus1,"CloseMinus1"); 
AddColumn(CloseMinus2,"CloseMinus2");
AddColumn(CloseMinus3,"CloseMinus3"); 
AddColumn(CloseMinus4,"CloseMinus4");
AddColumn(HighMinus1,"HighMinus1");   
AddColumn(LowMinus1,"LowMinus1");  

IQ_Feed_Explore