Missing Info in Tooltips

[Ralsch]

Greetings.

Maybe it's a dumb problem, but I can't find any solution for this with Google.

When hovering above the Cardboard Boxes (or Barrels, Parcel, etc.) there should be an info about the capacity of the item.
Like:

---

Parcel
16 Items
Delivery

---

I only get:

---

Parcel
Delivery

---

So... what the heck am I doing wrong?
Surely it's something obvious... but what?

Thanks in advance.

[henkelmax]

This tooltip is only shown when having items in them.