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Element with Z index lower is showing on top of element with Z index higher

Hi guys, in the next link, there is blue element that is moving from right to left while you are scrolling down, that’s what I want. While moving, this blue element is covering a picture, so this element is on top of the picture because it has a Z-index higher, but then while you keep scrolling this moving element should pass “behind” the black div, because the black div has an even higher Z-index than the moving element, but instead the blue element is passing on top of the black div, and I don’t want that.

This is the webflow project:

And here you can check my Read Only link:

Thanks for your help.

P.D. I don’t know if it helps, but it was working fine some time ago, I am not sure what happened.