Your site is loading images over plain (insecure) HTTP.
The image links in your HTML are to http://colebrannon.com/... They should either specify https or be relative links with just the path.
For example, you have:
<img decoding="async" class="swiper-slide-image" src="http://colebrannon.com/wp-content/uploads/2024/07/UTD-Logo-University-of-Texas-at-Dallas-ArmEmblem-utdallas_edu-PNG-Logo-Vector-Brand-Downloads-SVG-EPS-150x150.jpeg" alt="UTD Logo - University of Texas at Dallas Arm&Emblem [utdallas_edu] - PNG Logo Vector Brand Downloads (SVG, EPS)"/>
That src URL should either start with https:// or remove the protocol and domain completely and just be /wp-content/uploads/...