this happened to 2 projects up to now i download the project files and open them with unity in order to se what i'll have to work with but the scene is empty , anybody experiencing the same thing ? am i doing something wrong or did i just get unlucky with other peoples projects ?

I had a similar issue when I tested my submission. Solution: upload also project settings.

Are there any scenes in the Assets folder? I tried with my own project and by default Unity opens an empty scene, but I can still load any scene from the Assets folder.

Did the other devs not upload their project settings? I will go check with FloppyGameDev. Thanks!