Getting two addresses instead of one for site

I am getting multiple results for my site when viewing from other computers, but not my own. If I enter https://richardsondandi.com I get one result and then if I enter https://www.richardsondandi.com I get another. Both go to my site, but the first one does not have updated content and I am unsure why this is. There shouldn’t be a difference.

Thanks in advance for your help.