Users don't always use the tab key on the keyboard to navigate webpages, but the most common use would be on a form.
Web developers don't always think about users using the tab key to go from one form field to the next. Sometimes we make the assumption that the mouse will be used.
One of the most commonly used ways to build forms in WordPress is via a plug-in called Gravity Forms. While amazing overall, Gravity Forms has an issue where when a user tries to tab from one form field to the next, it sometimes jumps them around the page (if there is more than one form on the page, this is very common).
WordPress Developers may not always notice this Gravity Forms Tabbing Issue, and I've been guilty of not noticing it myself for several years, but when you use the tab key to go from one Gravity Forms field to another, the cursor doesn't always go in order.
Thanks for reading, and have a great day!
Paul Hickey, Founder / CEO / Lead Strategist at Data Driven Design, LLC has created and grown businesses via digital strategy and internet marketing for more than 10 years. His sweet spot is using analytics to design and build websites and grow the audience and revenue of businesses via SEO/Blogging, Google Adwords, Bing Ads, Facebook and Instagram Ads, Social Media Content Marketing and Email Marketing. The part that he’s most passionate about is quantifying next marketing actions based on real data.