As of late, the documentation for MongoDB Realm is not working correctly in Safari. It seems to occur on all of the documentation pages like this one
macOS 10.14.6
Safari 12.1.2
The issue is when attempting to scroll down the page, either with a mouse wheel, or dragging the scroll thumb, the documentation keeps jumping to the top of the page and will not scroll.
The issue was duplicated on multiple Macs with the same config.
It works correctly in Firefox.