@faizanzahid please start a new topic for this issue, thanks!
Newly created topic appears multiple times for other users browsing that category
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https://github.com/NodeBB/NodeBB/commit/a7bb5893e8297853cad15d104c87ad72d5ec0db2 might fix this issue, the same was happening on topics as well. If you navigated from topic to topic or from category to category, the socket listeners werent removed.