Can someone explain to me how it works on Adobe Stock . Recently I found at least a few companies on the internet offering wall murals and stickers with my photos from Adobe stock ( from 5 to 20 photos !! ). And on my profile there is only a download of 2 photos.
You found, with a high probability, companies offering print on demand of Adobe stock assets via the Adobe API. This is one of the possible uses as named in the contributor agreement. When a customer of theirs selects your picture, the company will licence that picture for a one-time use. At that moment, you will get paid.
Adobe's partnerships with external companies has been discussed here from time to time. Here's the most recent thread on that subject:
If and when one of these companies is successful at selling one of your images, you will receive the royalty from Adobe at that time.