Problem With ButtonDownFcn after Creating an Image Object

In my project, I load a background image to the axes by using imshow. Then I create rectangle objects on the axes, which I can drag around by associating ButtonDownFcn's with them. Everything is fine until I create an image object (a small image from png file) on top of the background object. After that, when I click on an arbitrary point on the background image, sometimes the rectangle objects jumps to where I clicked. It is not the same object, but at different times, different objects jump. Moreover, it does not always happen.

How can I make sure that Matlab chooses the right object (or does not choose any if I click somewhere else).

I have read many things about hittest, putting a hold on etc, but none of them worked. (Changing NextPlot messes up the display of the objects).

Thanks in advance!

Edit:

I created a .m file for this problem. And I realized that the problem occurs when I use 'imrotate' function. Adding another image does not harm itself.

Here is my code. Please replace 'oklahoma.jpg' with a big image and 'truck.png' with a smaller one.

function GUIProblem
f=figure;
set(gcf, 'WindowButtonUpFcn',@stopDragFcn); 
handles = guihandles(gcf);

handles.BckImage=fullfile(pwd,'oklahoma.jpg');
okl=imshow(imread(handles.BckImage));

handles.orgImgData=imread('truck.png','png');  

handles.ImageObjs=cell(1,1);
handles.NumImageObjs=0;

pB = uicontrol('Style','pushbutton','String','Create 50 rectangles','Position',[30 30 140 60],'Callback',{@pushBtCB,handles});
pB2 = uicontrol('Style','pushbutton','String','Add Image','Position',[30 100 140 60],'Callback',{@pushBtCB2,handles});
pB2 = uicontrol('Style','pushbutton','String','Rotate Last Image','Position',[30 170 140 60],'Callback',{@pushBtCB3});
guidata(gcf, handles);

function stopDragFcn(~, ~, ~)
set(gcf,'WindowButtonMotionFcn','');

function pushBtCB(~,~,handles)

num=50;
[mapX, mapY, mapZ]=size(imread(handles.BckImage));

X=rand(num,1)*mapY;
Y=rand(num,1)*mapX;

for i=1:num
    rectangle('FaceColor','r','Position', [X(i)-20/2 Y(i)-20/2 20 20],'Curvature', [1 1], 'linewidth', 1.5,'EdgeColor','r', 'ButtonDownFcn',{@requestClick} );

end

function pushBtCB2(~,~,handles)

     hold on 
    [quad, qmap, qAlpha]=imread('truck.png','png');  

obj=image([0 60], [0 60], quad,'Hittest','on');

handles.NumImageObjs=handles.NumImageObjs+1;
handles.ImageObjs{handles.NumImageObjs,1}=obj;
guidata(gcf, handles);

function pushBtCB3(~,~)
    handles=guidata(gcf);

if handles.NumImageObjs>0
    imgObj=handles.ImageObjs{handles.NumImageObjs,1};
    CD=get(imgObj,'CData');
    nCD=imrotate(CD,45,'loose');
    Xd=get(imgObj,'XData');
    Yd=get(imgObj,'YData');
    Xmid=(Xd(2)+Xd(1))/2;
    Ymid=(Yd(2)+Yd(1))/2;
    width=60*length(CD)/length(handles.orgImgData);
    layer=(nCD(:,:,1)==0)& (nCD(:,:,2)==0) & (nCD(:,:,3)==0);
    set(imgObj,'XData',[Xmid-width/2,Xmid+width/2],'YData',[Ymid-width/2,Ymid+width/2],'CData',nCD,'AlphaData',1-layer,'AlphaDataMapping','scaled'); 
end

function requestClick(hObject, eventdata)
req=hObject;
mB=get(gcf,'SelectionType');

switch mB
    case 'normal'

           set(gcf,'WindowButtonMotionFcn', {@dragRequest,req} );   

end

   function dragRequest(hObject, eventdata,req)

pt=get(gca,'CurrentPoint');

set(req,'Position',[pt(1)-20/2 pt(3)-20/2 20 20]);