There's a bug where the tabs in the Activity screen overlap the badge tracker section and it hides the "Track the next one" link. Chrome 69.0.3497.100 on OSX 10.14 Mojave.
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Yes, people have been noticing this on all sites throughout the Stack Exchange network. There's a 'central' bug post on the Main Meta which has now been marked status-completed, meaning it should be resolved.
