With bigger kmer found more similar sequences

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Hi developers,

I am recently use ModDotPlot to visualize CHM13 chr1, and I found a curious thing.

moddotplot static -f CHM13#chr1.fa -o CHM13#chr1 -k 50 -id 90

moddotplot static -f CHM13#chr1.fa -o CHM13#chr1_21 -k 21 -id 90

With bigger kmer but found more similar sequences, this looks doesn't make sense, right?

Best,
Shuo