Can anyone explain the reason for the rejection of the photos?

Quality issues, I guess.

Your third: noisy and has exposure issues:

I would also expect a slight white balance problem. But that may also be connected to the exposure.

Your second is also noisy, ill exposed and has chromatic aberration (arrow). In addition, I would have edited out the ship's name, even if it is not easy to read:

What and where are these buildings ...? Look at the competition at Adobe Stock and go to Youtube and learn to photograph and editing.

The first image is noisy. The second image is overexposed and has chromatic aberration. It would also have been refused for IP violations due to the visible logos and signs. The third image is underexposed , blurry and has a blownout sky. Did you edit any of these?