Thickness of the lines in the sankey plot

[evolbeginner]

I wondered why my sankey plot generated using Pavian online tool looks diff from those generated from others and the example files, as the thickness of the lines in my graph are very thin.

The version of kraken2 is 2.1.2. My cmd is

kraken2 --use-names --threads 4 --db KRAKEN2_DB --output - --report kraken2.report

The link to the original kraken2 report is link; expires in 30 days. Thanks in advance!