Gradient graphs seem wrong

While watching the videos on Coursera on Partial derivatives and gradients, I noticed that a few graphs don’t match their descriptions. For example, in the video Gradients, two graphs are shown in which one of the variables is supposedly kept constant. The graph labeled “Treat y as a constant” does not seem to have either x or y as a constant. Also, the graph labeled “Treat x as a constant” has y as a constant instead. Also, this same graph was labeled as “Treat y as a constant” in the Partial Derivatives Part 1 video.

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Can you post some screen capture images that show these issues? Add your own markup if necessary.

If you’re referring to something in a video, include the video title and a time mark.