Image getting cropped when OpenCV is loading image with imread

Hi, I'm using the cv2.imread to load the image.when I use the cv2.imshow(), i'm seeing a cropped image. Both the original image and the image we are using to find circles thorugh Hough transformation are getting loaded as cropped (and the crop is same in both images). Thus, my radii are smaller than the program (of course I adjusted the radii to reflect smaller numbers to identify the coins) and the brightness is different (don't know why).

The end result after adjusting the values was same. And I can understand the brightness numbers vary because the radii vary and the square which we are using to calculate brightness varies and thus different brightness values.

But why is my image getting loaded as cropped. I'm running a Core i5 computer with 16GB RAM (A bit old computer though), anaconda individual edition with spyder 5.1.5. But would OpenCV execution and results vary across platforms/machines/execution environments?

Thanks
Sree