OpenCV GaussianBlur filter Difference Python VS C++

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Is there any difference between the Gaussian Blur between C++ and Python? According to my code, for example, i have an image before the Gaussian, with the same values in C++ and in Python.

But right after the opencv Gaussian Blur the results are slightly different... :/

Note that width = lrx-ulx and height = lry-uly; so the problem is not there...

I do not understand why..? if anyone can help, it is appreciated.