You have 18 woff files loading on your page for the “Montserrat” font which looks like a Google font.
If you look at the font specimen page below for the Montserrat font there are indeed 18 files associated with the Montserrat font which means you are loading all of them. I am guessing that you don’t actually need to use all of them.
You are also loading 10 “Opensans” fonts.
One way to reduce this is to only load the fonts you are using. For example you could just load Montserrat regular 400 and Montserrat bold 700 if you don’t intend to use any italic or “light” versions of the fonts etc. Analyze which fonts you need on your website and then just load those particular fonts.
I think the strange names are added by the Webflow publishing system - it does the same for images when it automatically creates images of different sizes from a single user uploaded image which are then served up responsively depending on the screen size of the device being used.
You should be able to delete fonts in the fonts area of the project settings. If they are still being loaded after you delete them, I would assume this would be a question for Webflow support.