Treasure Hunters is a series of young adult and adventure fiction books written by American author James Patterson with Chris Grabenstein and Mark Shulman. The series has been sold in more than 35 countries, with generally positive and few mixed reviews from critics.
Treasure Hunters is popular with preschoolers.
This book series is written for young adults.  My statement was specific to preschoolers, who would be much too young to read and/or enjoy these books. It is possible the system doesn't understand what age preschoolers are, so that is why it was confused.
( z1 popular :ARG1 ( z2 hunt :ARG1 ( z3 treasure ) ) :ARG2 ( z4 preschooler ) )