Change Paragraph Style

I’m a WordPress newb working with a site that I inherited, so somethings aren’t making sense. Pages that have been on the site since it’s creation have a formatted paragraph style that, when formatted, shows up in the code and in published. However, new pages I make, even when formatted with that paragraph style don’t get formatted with the correct font and code. I’m using Agency Child Theme, and I know a minimal amount about stylesheets to know that every solution I’ve seen on the internet thus far has not worked.

Can anyone tell me how to make it where when I format the text by using the drop down box and selecting “Paragraph” that it will make it automatically format to the font I want?

Here’s what the correct code looks like:
“<span style=”font-family: georgia,palatino;”><b><span style=”text-decoration: underline;”>Education
</span></b><i>J.D.</i><i></i>, University of Mississippi School of Law – May 2016</span>
<span style=”font-family: georgia, palatino;”> <i>B. Accy. in Accountancy</i>, University of Mississippi – May 2013</span>”

and the incorrect code:
“<b></b>J.D., The University of Mississippi School of Law – May” 2017