BTC graph of Price vs graph of Market Cap inverted today -- is this normal?
EDIT: perhaps what I am seeing is due to different graph scales for the two values?

Yes, these two values are plotted on the same graph, but against different axis. Which line is higher/lower on the graph relative to the other is of no real interest.
Looking at the site in question, I can currently see that the y-axis on the left lists the 'Market cap', while the y-axis on the right lists the 'bitcoin price'. By adjusting the scale on either axis, the relative position of each plotted line will change.