Font sizes in Figma are bigger than in web

I'm having trouble transferring my Figma design to the web.
The font sizes in Figma are significantly larger than the actual size. 
To make a realistic design, I have to use very small font sizes in Figma (for example, using 14px for text, when clearly no less than 16px should be used for body text on a website).
Does anyone know what's going on?