Missed the post, sorry. Well, as I said before, we counts 2 downloads if the same IP complete download 2 of your different files. I checked with our tech, the counting is working perfectly fine.
I have checked with your download status, you have tried to download with 3 different IPs, for 2 files, within 13-15 April. For file 4, has been downloaded 3 times, download incomplete on 13rd, 14th, and download success on 15th (Group D). For file 1, has been downloaded 4times, download incomplete on 13rd,15th, and download success on 13(Group A), 14(Group D). The numbers showing correctly in your stat report.
We checked with our tech, our counting is working fine. The way you sharing the links might affect the download number compare to other hosting. Do you using mirror as well? Please try to share uploadstation only for a day for testing; I am sure the download number will increase a lot.