I have the same issue but saw that it is an issue with the template that allows you to switch from light to dark. This particular code in the CSS
@media (min-width: 576px)
.navbar-brand.logo-control img.logo-img-sm {
display: none;
as well as this
.dark-active .d-light {
display: none;
}
Is causing this. I tried unsetting it, but then you will see all the other images that are toggled between light and dark appear. I would say this is a template issue in how it was coded.
To test it, click on the light button on the top right. You should be able to see the logo when it switches to light.