Hello David:
This is an issue on how the Neutron quota driver, using the new ``DbQuotaNoLockDriver`` class, retrieves the "quota --detail" (that is also used in the Horizon counters). This issue has been addressed in 16.2 [1] and will be ready in 16.2.4.
Regards.
[1]https://bugzilla.redhat.com/show_bug.cgi?id=2102147
*** This bug has been marked as a duplicate of bug 2102147 ***