Fonts too small on frontend in browser but fine in page preview?

edited June 9 in Fonts

I manage the website and have an issue with the fonts that display on the frontend being too small. I've tried visiting the site using different search engines, Google, Bing, Yahoo etc and get the same result. Whereas, when I actually go into the page editor itself and view the preview of the page from the muffin editor or the 'preview in new tab' at the top of the wordpress editor, the fonts for content and headers display fine as they should and are the correct size. Have gone into the theme options and checked the font settings and nothing seems amiss, so not sure what the issue is or how to go about solving it. Anyone have any experience with this or know how to solve it? Many thanks in advance :) Screenshots are attached showing the difference in font size.

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