My browser displays the user reputation in the user's Activity page without a graph:
How can I display the user reputation with a graph, as shown in the image below?
You have three options:
Lower your browser's zoom level (I had to reduce it to 90% because I had Hide left navigation disabled in profile Settings).
Enable Hide left navigation in your profile Settings so you can see the graph at 100% zoom.
Use a monitor that has a higher resolution.