When a short fiction title is made a varient through the "Create new Parent" mechanism, the new parent record does not copy the storylen field from the existing record. See http://www.isfdb.org/wiki/index.php/ISFDB:Help_desk#short_fiction_variants_--_storylen for more detail.
-DES
Anonymous
Fixed in mod/ka_new.py 1.7
Implemented in r2009-49.