Requests made to deleted images are slowing my site

My WIP website is colinvfx.com and when I run it through https://tools.pingdom.com/ or https://www.webpagetest.org/, in the “waterfall” section I see requests made to images that are taking a lot of time.

The thing is, I deleted these images by connecting to my server with FileZilla and also removed them from my header/pages. I thought that maybe the testing websites were remembering old .jpgs/.htmls but the thing is, I only started trying out webpagetest.org today, after I had supposedly deleted everything.

I’m guessing it has something to do with my caching settings in my .htaccess but I’m not getting any results from modifying that yet. I was hoping someone could lend some advice. Thank you!