Hi @Barandouzi,
This looks like LEfSe output. If it is, then this is not a true cladogram, despite name of the function. It is merely a dendrogram based on taxonomic ranks, were each node is a taxonomic level. If you do not have | separating the ranks, then you're only ever going to see this "star" cladogram. Where each tip is a unique full taxonomy string.
I'd recommend installing dokdo into your QIIME 2 environment and then run the prepare-lefse command. Then upload to LEfSe Galaxy.