hamming results confusing me

[RichardCorbett]

Hi there.

I'm trying out your tool and it looks very helpful, so thanks for this. However, I'm getting some confusting results when running with hamming distance.

When I run this this:
design_edit_metric_tags.py --tag-length=6 --edit-distance=3 --multiprocessing --hamming --output tags6all.txt
I get 66 indices returned.

But when I run this I get 96 indices:
design_edit_metric_tags.py --tag-length=6 --edit-distance=3 --multiprocessing

Shouldn't I get more indices returned when I use hamming distance?