Open your Developer Forum (it can be from the website/the shortcut);
Click on your profile icon;
Have the notification category opened.
Ever since the error of 500 appeared, another issue came on its back, the notifications section not showing any further notifications of those you are following, being from a player of the forum/a category (from your taste to track the first topics after created)… Today, the bug has been solved and now users are able to see normally.
However, recently, I have been receiving constant notifications that are the majority not new and I have seen before: