As it can be seen, the background image doesn't fit the entire page. Is it possible to change parallax parameter in order to fit? Setting the image as pattern didn't helped either.
I can't see your images because are from your localhost. Can you update them, so I can investigate?
Ops, I'm sorry. Now they are there: http://www.chegadeagrotoxico.contraosagrotoxicos.org/#quem-somos
Try to add in Whoathemes -> General -> Custom CSS:
I'm not sure my question was understood.
I'm referring myself to this section: http://www.chegadeagrotoxico.contraosagrotoxicos.org/#quem-somos
Again you have an image from your localhost.
If you'll add the code from the previuos message, the image for that section will have the screen height.