Most Discord errors or glitches are fixable, and sending messages twice is one such error. There are a number of reasons why you might be experiencing this issue, mainly due to network issues, server lag, problematic bots, etc. Whatever the reason, we have all the possible solutions for it.
Think twice before sending Discord messages
Poor internet connection is usually the main reason for duplicate messages on Discord, as it can try to resend messages if the previous messages did not arrive. It is recommended to reboot or use a different router or connect to a different network.
Sometimes when Discord is down, there can be multiple outages in the browser version or apps. Find out if the servers are currently down and if so, wait a bit, because it will continue to stutter. Once the servers stabilize, you can go back to the platform immediately.
Disable bots if you have them installed, as this could be one of the reasons your messages are being sent twice. Always check for glitches or errors caused by a bot before enabling it.