Dark Web search

Dark Web search:  My Malwarebytes program did a free online dark Web search using my email address.  They found 6 possible password exposures, three of which I recognized.  LifeLock only found 1 possible password exposure.  Why is this?  

Massive breach leaks 26 billion records from new and previous breaches

Mother of all Breaches may contain NEW breach data

MG93825:
 LifeLock only found 1 possible password exposure.  Why is this?  

Hello @MG93825
Welcome to Norton Community

Do you run LifeLock by Norton plan? 
Do you run Norton 360 w LifeLock plan?
Do you run Norton 360?

Sorry, I've no idea...why. 
Lets hear from Norton Community 

For questions on Dark Web Monitoring, read - Other frequently asked questions on Dark Web Monitoring  
To know about a notification you received, read - Why am I receiving a notification that my information is found on the dark web?
To update your information, read - Update your financial accounts, mailing address, and other personal information for Dark Web Monitoring

https://support.norton.com/sp/en/us/home/current/solutions/v127344370 08-Jan-2024

Dark Web Monitoring§
Dark Web Monitoring searches the dark web and notifies you should your information be found.

No one can prevent all cybercrime or identity theft.

§ Monitored information varies based on plan. Feature defaults to monitor your email address only and begins immediately. Sign in to your account to enter more information for monitoring.

https://us.norton.com/feature/dark-web-monitoring 

Caveat: only my Norton email is monitored. 

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Has your personal data been exposed?
https://www.malwarebytes.com/digital-footprint

Check if your email address is in a data breach
https://haveibeenpwned.com/