Number of sold tickets incorect

[robertdijk]

Describe the bug
For the Ski Trip, 47 tickets are sold.
This can be seen in the ticket overview and the CSV export.
But on the admin panel event page, it shows only 46 sold for this product.
This is also the number that is used for the event limit if I'm not mistaken.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://events.wisv.ch/administrator/events/view/96dc83b0-d5ee-4e25-8dc4-cd696a14c1bc/
2. Look at the amount of tickets sold
3. Go to https://events.wisv.ch/administrator/events/overview/96dc83b0-d5ee-4e25-8dc4-cd696a14c1bc/
4. Look at the amount of tickets sold

Expected behavior
The number on https://events.wisv.ch/administrator/events/view/96dc83b0-d5ee-4e25-8dc4-cd696a14c1bc/ should be 47

Screenshots