When a DB server chucks a wobbly and gets kicked back into line it'll be out of kilter with all the others who were innocently minding their own business and plodding on regardless.....
It won't be uncommon to see statistics all arse-about...eg something may have more downloads/hits than another but shows lower in a list.
Sooner or later it all gets resynched.... and generally no deaths are reported [and any bodies are hidden]....
Not so much a 'bug' as it is a 'bugger'...
I spent all yesterday trying to DL a game I'd purchased....wasn't huge...600meg....so many times it got to 100% then totally disappeared. Even tried it via Virtual Machine....still no luck. [Nothing to do with SD though.... Third Wire]. It clearly was a server drama...as I eventually succeeded overnight.
It happens...