megahit iterations: 99-25=74 modulo 4 is 2 and not 0
you are producing with megahit kmer assemblies from 25 to 97 with increment 4 and additional the 99 kmer assembly, which is an artefact by the megahit tool. At some point you should change this, also in the documentation, it is misleading because 99-25=74 modulo 4 is 2 and not 0