Reload probably means that they have implemented it fully on the server side. So the cookie (about the cookies) gets set through the server, or worse, they initially send down the cookies and then clear them with the reload.
If you are talking about this and not malicious reloads that make giving a consent harder. (I haven't seen that latter and the former doesn't bother me.)
Some even make it slow to accept, or reload to a homepage after submitting, instead of back to the original page. It just doesn't make any sense to me. But apparently people just accept it as the way the internet is nowadays.