Could it be because your reports may look "controversial"?
Some maybe - but
Seven Hundred?
From a moderator's point of view, it may be better to not do anything to not then appear to be taking sides with someone and then find themselves criticized later in a 'drama' thread.
Your ratio between 'good' and others is too huge. It looks like if they decided to ignore you, which I doubt. Hence my question about your reports.
Quite a lot of my reports have been threads where one user has posted multiple times (usually five or less minutes apart) - at a guess, the admin/mods have looked at the sheer numbers reported and decided not to bother.
Iirc, I've read somewhere that unhandled status is sort of euphemism for "soft bad", like report is most likely bad, but mods are not sure and don't wanna mark it as such etc in order not to ruin report accuracy so they just leave it unhandled, or something along those lines.
Maybe, but I'd say it was the numbers of reports as the bulk of my reports have been for sequential posts by the same user.