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Every cladogram is based on a particular dataset that was analyzed with a particular method.
Datasets are tables consisting of molecular, morphological, ethological and / or other characters and a list of operational taxonomic units ( OTUs ) which may be genes, individuals, populations, species, or larger taxa that are presumed to be monophyletic and that are presumed to form, all together, one large clade ; phylogenetic analysis reconstructs the branching pattern within that clade.
Different datasets and different methods, not to mention violations of the mentioned assumptions, often result in different cladograms.
Only scientific investigation can show which is more likely to be correct.

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