This is a screenshot of the front page, with the slider at the top:
This is a screenshot of the blog page (by clicking on the “blog” link in the menu), and you can see the same slider is at the top of the blog page too:
The result is that when you are on the front page and you click on “blog”, it appears as though the link hasn’t worked and you’ve stayed on the same page, because the same image on the slider shows on both pages.