This is by design. When the Infinite Recurring Donation option is selected, only one payment will remain 'scheduled' at any given time.  After each payment is processed, the next scheduled payment will display, and so on.

If you wish to change this going forward and be able to view all upcoming payments in the recurring gift schedule, disable the Infinite Schedule option within the initiative. This will prompt a drop-down box to appear on the donation form to allow donors to choose the number of installments. Note that the maximum # of payments available can be configured for up to 60 installments.