Buttons and font style changed

Hi Michael,

Welcome to the Divi Community.

A theme that is deactivated will have no impact on the website whatsoever.

So, there could be two reasons behind this problem:

1. Caching
2. Theme options of the active theme have been reset to default.

<h2>Clearing Cache</h2>
First, try to see if it is a caching problem by clearing the cache and you can do this by adding random data to the end of the website URL.

For example, If the website URL is:

https://yourwebsite.com/

Then you can add random data like this:

https://yourwebsite.com/?cache=busted

The random data starts with a question mark (?) followed by a key and value.

And the key and value can anything. For example:

https://yourwebsite.com/?michael=randomtext

You can use this technique for any page URL.
<h2>Reconfigure current theme options</h2>
Button and Font options usually reside inside the “Theme Options” page or “Customizer” page based on the active theme.

This is rare, but sometimes when you switch between themes, the theme options will reset to their default state and the only way to recover the old theme options is to restore an old backup of the website.

But this is a tedious process if you are a non-techie.

So, if this is the case, then it is often recommended to reconfigure the theme options according to preference.

Hope this helps 🙂