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This is especially true if YouTube servers are experiencing technical difficulties. Some users have suggested that logging out and back in will solve this problem, but that’s not a guaranteed fix. The company has recently been tweaking how comments are displayed, so any disappearing comments may actually be intentional. One of the more common theories is that this bug occurs after Google pushes out new updates to the platform. It’s not entirely clear why YouTube comments will occasionally disappear. If comments are still gone after restarting your browser, you can usually fix the problem by clearing your browser cache.
It’s possible that YouTube comments aren’t showing up due to your internet browser’s cache.
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