Looks like the course has collapsed topics setting as the course format. That's an addon. Is that addon installed and up to date on the new home of the course?
If you turn on editing first, then navigate to the course, is there a course admin menu? Could change format of course that route or via direct DB manipulation given you know/and can see the course ID number.
mysql> select id,fullname,shortname,format from mdl_course;
if you add a where clause for the known course id you get only that courses info:
mysql> select id,fullname,shortname,format from mdl_course where id=3;
+----+-------------------------+-----------+--------+
| id | fullname | shortname | format |
+----+-------------------------+-----------+--------+
| 3 | Moodle and Command Line | MDLCLI | topics |
For the course that has issues, topics above could show 'collpasedtopics' or similar.
Could change that info to whatever format is available on new sytsem.
https://www.mysqltutorial.org/mysql-update-data.aspx
'SoS', Ken