Hey, @Nabilum! That's a lovely scene!
Now, from what I see, even though you have one grouping of layers selected (that top section), you actually have all 10 of your used layers active. In the Layer section (below top), where you have Scene and Layer, try just selecting the layers that you want to have rendered.
I have to do that again, myself, to be sure it makes sense what I'm saying. Right now I can't. But anyway, try that and see. Hope that helps!