Obviously it wasn’t affecting everyone or else you’d have tons of websites complaining. I had sent in a bug report as well as contacted my friend who works at Facebook who forwarded my issue to the appropriate department, but I never heard back.

I’m happy to announce that the problem has been fixed. I took some time this weekend to investigate the issue and found out it was related to the open graph changes I made in the middle of November. It turns out that if you include og:tags, the like button behaves differently. When I removed the og:tags from the site, the likes were incrementing correctly and even showing the previous like count.

After a bit of searching I landed on this page: Open Graph Protocol on Facebook. The real useful thing was the Facebook URL Linter, a debug tool to show you what Facebook sees when it parses your website. It turns out I was missing fb:admins or fb:app_id from my meta properties. After adding the app id (which you can register for one here), things started working again.

Another really useful trick I learned was that you can force Facebook to clear its cache and re-parse your page by using the Facebook URL Linter tool. Sometimes Facebook fails to fetch your thumbnail or if you decide to change the title/description, new people liking your page will still get the old data. But if you run your page through that debug tool, it’ll refresh.

Hope this helps anyone else who’s hitting a similar issue!