I changed the WordPress address to be https and changed the Site addresses to be https.
The website is lifeissimplysweet.com
If that address is typed- not clicked on the link, not copied and pasted- but typed into the address bar, it looks like this: https://ibb.co/7nRjkPg
If you click on a link to the site, or if I click “View Site” through Word Press, it shows up how it should, like this: https://ibb.co/pwhHR9L
As mentioned before, the Word Press expert said that “header image is set to HTTP instead of https so if you visit the https version of your site the image can’t load due to “mixed content” error.”