Pixel variance between IPP7 vs IPP9 using ippiCopy

Hi,

As titled, I'm currently having trouble obtaining the equivalent pixels value between IPP7 and IPP9 when I'm trying to copy a 8-bit image using ippiCopy. To confirm the variance, I've print all of the pixel values of both images into CSV format individually and compare both of them using winMerge, the variance were off by somewhat a large amount (between 1 to 60). Due to that, the generated result after different types of image processing method were affected as well. Were this suppose to be a bug or intentional?

Code Snippet:
IppStatus status = ippiCopy_8u_C1R(src, srcPitch, dst, dstPitch, srcRoiSize);

Update:
Apparently the problem lies in the IPP9's ippiCopy, pixels value were somehow altered after passing through ippiCopy, where as the IPP7 remains the same. Any fix on this?

Please advise.

Thanks,