@wfalaa yep, still seeing this with 7.1.0 in Chrome 65 and Firefox 60 on Ubuntu 16.04. (I should have mentioned that earlier.)
Couldn’t reproduce this on Windows 10 width Edge and Chrome.
I don’t have any idea why this happens on Ubuntu…
Any chance I can submit a PR to your repository that only enables font-loading if you are on a Wordfence admin page (where the font is actually used)?