Fonts changing in draft mode

Hi, I wanted to use the customise - draft version of the website to change fonts, however when you view the draft version, the font are not changing (they are the originial theme fonts). See the screenshots where you can see the font isn't changing on the Draft, it should be the same as the Customiser Customiser https://prnt.sc/so0kul Draft https://prnt.sc/so0k1l Live https://prnt.sc/so0kew