On the registration page, "Limit" refers to the "Limit Per Order" or the number of tickets a donor can purchase per transaction.

To view and adjust this setting:
1.) Go to Content > Events
2.) Edit your Event
3.) Click Step 6. Configure Ticket Types
4.) Click Edit next to the Ticket Type
5.) Go to a. Edit Ticket Information under Step 6. Configure Ticket Types
6.) Adjust the Setting on Step 6. Limit Per Order
7.) Click Next