I recieving a Error on my theme

The following options will be deprecated soon, Please DO NOT use them and use a Header template instead.
I am seeing this message in the customizer in both the header and footer areas.

2nd Question: I am creating blog pages from scratch using Elementor and my HTML tags are completely messed up, I realized this when one of my posts wouldn’t rank due to header mismatch. something is in the backend of the theme that’s giving a header title to posts and areas irrelevant to the on-page blog and the crawler finds it irrelevant content too, I am guessing this is an issue why it is not ranking. Any help will be appreciated, I also don’t know how to change the HTML tags at the backend. Thanks in advance.

Here is a link that i checked on SEOquake when i realized of the blank headers.