[Koha] All items "not renewable"

[Michael Kuhn]

Hi

Using Koha 16.11.04 (via Debian package installation) on Debian 8 I 
encounter the following problem.

In Koha menu "Administration > Circulation and fine rules" a single rule 
for all patron categories and all item types was defined. The rule 
includes:
* Renewals allowed (count): 3
* Renewal period: 19
* No renewal before: [empty]
* Automatic renewal: No
* No automatic renewal after: [empty]

However, when looking at the actual checkouts of any user, the column 
"Renew" always says "Not renewable (0 of 0 renewals remaining)" for 
every single item. Instead I would expect to see "Renewable (0 of 3 
renewals remaining)".

Restarting Koha / Plack and clearing the webbrowser's cache doesn't 
change a thing, unfortunately.

How is this possible, why are all my items "not renewable"?

Kind regards, Michael