Home page shows up as secure, however forum is not

I see only one mixed content warning:

Mixed Content: The page at ‘https://dentalimplant411.com/dental-chat-room/’ was loaded over HTTPS, but requested an insecure image ‘https://subtlepatterns.com/patterns/gplaypattern.png’. This content should also be served over HTTPS.

That seems to be coming from your theme’s global.css file:

#container {
    background: transparent url(https://subtlepatterns.com/patterns/gplaypattern.png) repeat scroll 0% 0%;
    color: #333;
    text-align: left;
    line-height: 1.4;
    margin: 0;
    min-width: 990px;
    font-family: Tahoma, Verdana, Arial, Sans-Serif;
    font-size: 13px;
}

Thank you for your reply Steve. I was unable to fine this in any of the css files. I also searched in the file manager for these specific lines and was unable to find anything.
When I ran a test through whynopadlock.com I received this error message:

An image with an insecure url of “https://adept-testing.com/dental-implant/wp-content/themes/dent-all/assets/images/circlehubb.png” was loaded on line: 273 of https://dentalimplant411.com/.

I tried deleting the circlehubb.png file but that did not change anything. Is there anything else you think I could try to resolve the issue?

Use the plugin https://www.ads-software.com/plugins/string-locator to find that link in a CSS file. It’s probably part of your theme.

Deleting the image file won’t help the issue if you still have links to it. Find it on the page and remove it from there, then re-upload it and insert it.

-I found the lines of code and modified them. That did not seem to help.

-The image in question does not show up on the webpage (firefox and Safari). I think it may be blocked because it is the file in question. That is why I tried deleting it and uploading it from my hard drive. I do not know if I would be able to delete it any other way.

-I wanted to ask you if you know how the browsers recognize that the image was uploaded from the original http source:

“Loading mixed (insecure) display content “https://adept-testing.com/dental-implant/wp-content/themes/dent-all/assets/images/circlehubb.png” on a secure page”

Is there a way to eliminate the source trail? (this is what I thought would happen when I deleted the image in file manager).

Thanks again for your help.

You need to find the link to that file, probably in CSS, and fix it there.

It worked. Thank you much. It is amazing how simple things are once you understand them, and with the help of useful tools. I appreciate your help Steve.