After I upgrade from 4.0.5 to 5.1.5, my thread ids have changed

[ccf]

After I did the upgrade all my threads Ids had been changed. For example:

This is what I did:

1. I backup the DB
2. I imported it.
3. I run the /install/upgrade
4. It runs with no issues

When I check the same thread in Production and on my Box the URLs had changed.

Before:
finance-charges-apr-compare/11174-tried-lower-my-apr-chase.html

After:
finance-charges-apr-compare/11184-tried-to-lower-my-apr-with-chase

This will impact my SEO


Please, help me. I will really appriciate it.

Note: I google it for about 2 hours, no solution yeat.