Newest category not visible when creating a reservation

I created a reservation with 1 ticket using a "New category".
Since I should have inserted 2 tickets, I cancelled the reservation (using the public url)

The new category still exist in the event (correctly)

When I then created a second reservation I wanted to use the same category but it didn't appeared in the list of existing categories.
So I created again a reservation using "New category", with the same name.

I now have 2 categories with the same name in my event