You have not presented any evidence that your ratio has reduced in the absence of any downloads.
Neither did you say by how much it has reduced.
We do no log your activity in sufficient detail to enable us to mount an investigation so there's nothing more we we can do or say.
If there was a problem with our tracker or server then we would be getting lots of reports of ratio issues. As it is, your's is the only one.
My best guess is that your ratio has not gone down and it is your memory that is at fault.
You have a respectable ratio and plenty of seedbonus, so even if I could investigate further, I probably wouldn't because it really doesn't matter.
Read the post that vdogeek gave you. You might find something useful there
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I'm going to end this now before the discussion goes even further off track with more irrelevant discussion. ( This has nothing to do with hit and run ).