The appearance of the page slightly differs when viewed by different web browsers; so, sprites sometimes overlap accidentally if the font size is different from the original size.
The Publish Mode reduces such cases. However, Publish Mode takes a little effort to arrange the sprites. Only one user must edit a given page at a given time. See also Publish Mode
The Publish Mode is OFF by default.
While we are on the subject, I would like to add that these manual pages of PositLog are written in the Publish Mode.