Navigate to URL problem

My site consist of one page. From two different menu text I have links into this one page. These links are made in Menu Manager as Navigate to URL -type. Anchors are #bloc-2 and #bloc-5. Inside these blocks are text content. When I preview the site in the browser and test these links, the link target will not be visible how the bloc is. It seems to behave so, that the top of the blocs will be under the (sticky) header. And this mean that part of the text will be underneath the header. This is some kind of bug. Norman, is there anything you can do with this?