Quoted from terryb:Novus 2 is a polish, not a replacement for wax.
+1 Also make sure the wax you use after Novus is not a "cleaner" wax.
Looking at another angle, how was the surface prepared before you touched up the paint? It may also be that there was something under the touchup paint that prevented the paint from bonding. Even old wax under the paint could cause this.