SSL problem in checkout with encryption

Hey all. Completely confused here, and looking for some assistance.

I have a SSL certificate through GoDaddy added onto a new WP website with Woocommerce. Everything is bone stock here (no coding manipulation). When I go to the checkout page, which just has the customer name, address, number, and email forms prior to clicking to go to authorize.net for the payment (only option I have selected), that shopping cart page has a warning over the secure green lock (using Chrome browser). It states the site is “encrypted with obsolete cryptography” and then goes on to say “however, this page includes other resources which are not secure” … it also says:

– the connection uses TLS 1.2
– The connection is encrypted using AES_256_CBC, with SHA1 for message authentication and ECDHE_RSA as the key exchange mechanism.

First, this is all foreign to me. Second, I contacted GoDaddy and they said (five different reps) the SSL is set up right, but there are things on the page that are not secure and that is causing all of this. I have stripped out the header, footer, and everything else I can think of, so the page is just the checkout info, and still have that problem.

I installed an HTTPS plugin to force SSL on all pages, and that still hasn’t fixed.

Anyone have any idea of where I should look here to fix? Completely confused.

https://www.ads-software.com/plugins/woocommerce/