Hi @zorro7120, it sounds like you might not have all the required font versions of the custom font loaded on the fonts tab. For maximum browser support, install the TTF, EOT, OTF and WOFF versions of the webfont.
If you do not have these, you get generate a webfont package based on the font you do have, from FontSquirrel Webfont Generator: https://www.fontsquirrel.com/tools/webfont-generator
I hope this helps, if not, reach out to Webflow support from the Contact page: https://help.webflow.com/contact
p.s. Fonts in Word are not Webfonts, those are desktop fonts, there is a difference. You will need to generate Webfonts to use on the web.