So ive began setting up my station to have a general rotation of metal music with 6 intervals of rock music played after a certain amount of songs. Problem is either the interval playlists are not playing all 6 in full or they are playing them out of order. This is how i basically want it set up,

General Rotation- Metal
Alt Rock 1-
Classic Rock 1
Classic Rock 2
Hard Rock 1
Hard Rock 2
Alt Rock 2
General Rotation- Metal

I wanted to have the rock block start roughly around 15-16 songs in and figured when i set up the playlist it would basically be 15,16,17,18,19,20 and then back to the metal rotation. What am i doing wrong? Thanks for any info regarding this matter.

James