You might see this unusual sight when using manual exposure and auto ISO, then pressing the exposure lock button.
One of the marks on the exposure meter will show the metered value, the other is the camera suggested value for where the camera is now aimed. This can happen with any metering mode, if you lock the exposure and then recompose the frame.
Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --
