This image shows a map generated by the <mapframe> tag. All push-pin markers are on the map. After clicking the full-screen control the map appears in full-screen mode.
In full-screen mode dialog elements are added to the right and the bottom. In order to center the map the map was shifted to the left and to the top. Without doing anything now we close the full-screen map.
The original <mapframe> map is now shifted, too which should not happen.