Registration for Zoom

That is likely just your computer auto-filling the form based on your previous form submissions. When someone else opens that registration site, they will not see your info. 

To test this, open that registration page in an incognito window. This will open the registration page without any of your previous info and will be how the page appears to everyone else that opens the page. This article has info on how to open that type of window in any browser: https://www.howtogeek.com/269265/how-to-enable-private-browsing-on-any-web-browser/

Hope that helps and please make sure to mark the solution as accepted if this information is what you needed.