Probably a sign that MAX_DISTRIBUTIONS needs to be increased :-)
In the CVS base the file database.c list:
#define MAX_DISTRIBUTIONS 1000
It will be fixed in next release of rpmfind (no ETA yet, probably
in time for next release of Red Hat).
Instructions for getting CVS access are at
The version 1.7 I released monday 22 should fix this and show up in
rawhide soon, availble independantly at ftp://rpmfind.net/pub/rpmfind/