Found one problem (bug?) in qBittorrent client for Windows x64, version 4.3+.
Some torrents have wrong coeffivient value.
I.e. on screenshot:
total size = 16.89Gb
upload size = 82.63Gb
download size (maybe in last session) = 1.98Gb
coefficient = 41.57
As I see, this value was counetd like 82.63/1.98.
But actually must be 82.63/16.89=4.89 but not 41.57.
Please check formula for coefficient - must be next:
K = (upload size) / (total size)