Ah I see - strange behaviour. Sorry the spaces thing might be a false alarm then.

That header section seems a bit messed up somehow, the title moves in a parallax fashion to the rest, it just doesn't seem consistent. It could be that some rendering is done improperly because the page is accessed partway down when going straight to an Anchor and something at the header is expected to be rendered first?

It might be best to try and redo this fresh on a test site and get it how you want as there could be some remnants of things in your header area that is causing a problem? I have had stuff in the past and where i've 'messed about' with things a bit and had no end of troubles for this reason, only for them to work fine when I redo fresh.