Contract numbering not sequential

Summary:

We have a contract sequence created, but we don't understand the numbering that ERP is giving to the contracts.

First ones seemed fine but then it jumps 1000 for a few, then it seems like is going again sequencially, just to change again with jumps of 1000.

Any idea why this is happening?

Content (please ensure you mask any confidential information):

The numbering that contracts are getting:

The sequence that we have setup:

Any idea how to not have this huge gaps?

Regards,

Joana

Version (include the version you are using, if applicable):

24C

Code Snippet (add any code snippets that support your topic, if applicable):