I had the exact same panic yesterday and got the same assurances that this is a known glitch. I have to say, I am glad that the calculations are wrong as I did think I was at probably meeting that goal (not 13% as it said on my profile!). However.... as one other host comment said, how can it be the host's fault if a guest just does not take the time to write a review. This 50% requirement is bugging me in general now even after they fix the glitch with cacluations. Higher volume hosts might get a higher percent of people who are happy enough, got what they paid for, and do not feel like reviewing. Plenty of my guests seem not to look at their Airbnb account at all after booking as proven by ignored messages about forgotten items. The review process is not a one click thing, it takes some involvment from the guest. Many normal people might choose to skip it. And that should be fine, the host should not be penalized. No news IS good news.