Yup, there's clearly an issue with logging your progress % on our servers, though that is separate from our logging your actual ride spins and completion. I'm still looking into it, sorry for the trouble!
UPDATE: It seems to have worked for you recently since it now shows "100%" for Arches. I've made the fix locally that will prevent future such problems for you, but am working on one more thing for the Explorer build before I put it out again.
UPDATE: It seems to have worked for you recently since it now shows "100%" for Arches. I've made the fix locally that will prevent future such problems for you, but am working on one more thing for the Explorer build before I put it out again.