Don't know exactly when this started, but scrolling is kind of broken with Safari. I see this all the time on a mac. I've seen it a few times on an iPhone.
When I scroll, page 2 will not load. It will just show page 3. clicking on the "load content" button for page 2 does nothing.
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Your browser/os information:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/602.4.8 (KHTML, like Gecko) Version/10.0.3 Safari/602.4.8 (this will help us make sense of your bug report)