Items are incorrectly arranged into multiple lines on group sizing if the group's AllowWrapItems property or the layout control’s OptionsItem.AllowGroupWrapItems property is set to True in certain cases

Hello Sebastian,

It seems there is an issue with our optimization methods for wrapping Layout Items. I will forward this thread to our developers for further research.
I suggest you try to "disable" this optimization and see how the application will work without it. For this, try to comment out the following code string in the TdxLayoutContainer.SimpleWrap function (dxLayoutContainer unit):

Delphi
  ...  
      while ACurrentLevel.Index < AGroup.Count - 1 do  
      begin  
        ...  
        if (GetWidth(ACurrentLevel) > AMaxWidth) or (ACurrentLevel.Count > AMaxColumnCount) then  
        begin  
{  
          if ACurrentLevel.Index = AGroup.Count - 1 then                         //HERE  
            OptimizeWrapY(ACurrentLevel, GetHeight(ACurrentItem))  
          else  
            OptimizeWrapY(ACurrentLevel, 0);  
}  
          if (GetWidth(ACurrentLevel) > AMaxWidth) or (ACurrentLevel.Count > AMaxColumnCount) then  
          begin  
            ANewLevel := AddWrapLevel(AGroup, ldHorizontal);  
            ANewLevel.Index := ACurrentLevel.Index + 1;  
            ACurrentLevel[ACurrentLevel.Count - 1].Move(ANewLevel, 0);  
///            OptimizeWrapX(ACurrentLevel);                                      // HERE  
            ACurrentLevel := ANewLevel;  
          end;  
        end;  
      end;  
    end;  
  end;