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Greasy Fork currently uses Vanilla as a forum solution, with many customizations to enable script reviews and such. Vanilla was initially chosen as it is a mature forum solution, requiring little work for a lot of features.
The downside is that the integration between the forum and the rest of the site is not 100%. There are many things that don't work correctly, or at all, when the two are put together. As a result, Greasy Fork will be moving to a built-in-house forum solution.
The first phase of this has just been launched. Any scripts that do not have discussions in the Vanilla-based forum will now have any new discussions in the in-house forum. All previous functions of these discussions, including notifications and reviews, should be working.
Please let us know if you see any issues. Once we have more confidence in this solution, we will be migrating script discussions in Vanilla to the new system.