Comment 3 for bug 1832814

"""
but in our case, the names are quite different - for example the OSA format is missing the cc- prefix; thus unless placement is looking for just compute09 then this *shouldn't* be an issue as placement is registetered against cc-compute09-kna and compute09.openstack.local - it'd be unlikely that these are being mixed up.
"""

The issue is likely with the difference in node names (which is what's used for the resource providers' names). This means new providers were created and the old ones are still around. It may be that placement is sometimes giving results for the wrong node?