It's an effect of the endless scrolling feature that sometimes the last post shown is the first post loaded with the new page so it ends up looking like a double post when it is really just the one.

Endless scrolling can be disabled in your account settings.

It's an effect of the endless scrolling feature that sometimes the last post shown is the first post loaded with the new page so it ends up looking like a double post when it is realy just the one.