Hi QIIME2 developer,
I have found an interesting issue which needs your help. I basically followed Moving picture tutorial pipeline to process my 16s data covering V4 region. I did quality control by DADA2 and classified taxa by Bayesian classifier. Here is a small list of taxon I am interested and their taxonomic table and phylogenetic tree(I relabelled the tip name by their phylum ID).
Looks these taxa are classified pretty solidly. But why some taxa from same phylum(e.g., Firmcuites) were clustered into different branches together with taxa from other phylum? Is that normal from evolutionary perspective or due to some possible issues in processing?
Thanks in advance.