1/ Go the stock item that sells spaces on those courses and check what you have on the Links tab – should be as per below:
2/ Go to the original course you used as the template for recurrence and check what you had on that course on the Stock Items tab.
3/ If you need to add in those courses to be sold by the stock item, go back to the Links tab of the stock item and click Add as below:
Select All of the courses and click Add.