When a config page is scrolled all the way down, the save button moves to its regular place at the end of the page, when then the text length changes, e.g. by clicking on an Advanced button or a help link, the Save button stays at the same position covering a section of the text in the middle (see screenshot).

(cosmetic thing, however this quite annoys me when configuring Sonar, which is the last entry on the page usually)