Build history appears for some jobs but not others. Yet configuration identical?

When I look at certain jobs I can see that some have 15+ items in the history.
Another job shows only 1.

What I have checked:
configure → differences in config file.
diff of config file.
Date of jobs. Both contain recent jobs.

What kind of jobs are they? Pipeline? Freestyle? Multibranch?

Were there old ones deleted maybe?