The Font is present within the HTML & CSS, so its there but not applied - I get the following error in the Firefox console:
downloadable font: no supported format found (font-family: "Oracle-MediumMono" style:normal weight:400 stretch:100 src index:1) source: (end of source list)
Are the fonts applied via link from google fonts? how are they uploaded into Lay Theme?
Would be a good idea to convert the woff into a .woff2 format and run a test using it via woff2, just to debug and get closer to issue. 💥