How to find and edit rowid generated in export file by User export

After multiple imports and edits to the same user, the ID (llx_user → rowid) generated in the export file has value which is not in serial number.

For example, I have three users. I have imported another user next. Now the next serial number after import should be 4, but its showing 9. Why?

Why the rowid in the export file is not a serial number but a random number?

How to find and edit the rowid generated for each and every user?

Any guess about the issue…

It is not a random number but a counter, in your example, ids from 4 to 8 have probably been created and later deleted.
The new one takes value 9.