Responsive Menu Changes My Site's Font

Hi, I was excited about the plugin, but it changed my site’s font. Any thoughts on why or what I need to do?

here is a screenshot of my site the way it should look.

Here is a screenshot of the site with Responsive menu activated.

Here is a screenshot of the menu. Again it doesn’t import my theme’s font but actually overrides it.

Thanks for any help.

https://wordpress.org/plugins/responsive-menu/