Purchase order says it belongs to anonymous user, but is linked when clicking PO

Description

In Commerce manager, it looks like a purchase order (PO) belongs to the "Anonymous" customer when looking at the "Todays orders" list. However, when opening the PO detail view, you see a customer tied to the order.

Note: We are using the "Episerver.Commerce.Order" classes.

Steps to reproduce:
1. User logs in. (We are using IdentityServer for authentication.)
2. User places product in cart. (If no cart is active, one is created).
3. User checks out cart.
4. PO appears in Commerce Manager.

Expected:
PO belongs to user.

Actual:
It says the PO belongs to an anonymous user. But when clicking the PO, it seems to be linked to a user.