If WhatsApp keeps repeating the same update even though it was already installed, it could be due to several reasons. Let's explore some possible explanations:
Glitches or bugs: Software applications, including WhatsApp, can encounter glitches or bugs that may cause unexpected behavior. It's possible that a bug in the update mechanism is causing the repeated update notifications. Developers often release patches and updates to address such issues, so keeping your WhatsApp version up to date may help resolve this problem.
Incomplete installation: Sometimes, an update may not install properly, leading to repeated update notifications. This could occur if the update process is interrupted, the device runs out of storage space, or there are compatibility issues. In such cases, try reinstalling WhatsApp from scratch to ensure a clean installation.

Data corruption: Corruption in app data can also lead to repeated update prompts. If certain files or data related to the update are corrupted, WhatsApp may incorrectly detect that an update is needed and repeatedly notify you. Clearing the app cache or reinstalling the application can help resolve data corruption issues.
Server-side issues: WhatsApp relies on servers to distribute updates and notifications. Temporary server-side issues or inconsistencies can cause repeated update notifications. It's possible that the server is not registering the update properly or is sending repeated notifications erroneously. This is usually resolved on the server side, and users may not have control over it.
Delayed acknowledgment: In some cases, even if you have successfully installed the update, the acknowledgment from your device to the server may be delayed. As a result, the server continues to send update notifications until it receives confirmation of the update. This delay can occur due to network issues or congestion. Waiting for some time or manually triggering a synchronization process may resolve this.
User account issues: Occasionally, specific user account-related issues can cause repeated update notifications. These issues could be account-specific and may require technical assistance from WhatsApp support to resolve. Contacting WhatsApp's support team or visiting their official support channels could provide further guidance in such cases.
Third-party apps or modifications: If you have installed third-party apps or made modifications to your device's operating system, they could interfere with WhatsApp's update process. Incompatibilities or conflicts with these apps or modifications can result in repeated update prompts. It is recommended to uninstall any suspicious or untrusted third-party apps and restore your device to its original settings if necessary.
If you continue to experience repeated update notifications on WhatsApp despite trying the above suggestions, reaching out to WhatsApp's official support channels or seeking assistance from their community forums would be the best course of action. They will have access to specific troubleshooting steps and may be able to provide a solution tailored to your situation