When I had checked earlier, the accuracy shown on the reporting page was 100%. I recently reported a post, and as I was doing so, the accuracy shown was 89%. I hadn't reported any posts between the time I checked and when I saw it, and I'm quite sure the time I last reported something was quite some time ago (unless my memory is failing me.)
well when we submit a report, it will be marked as 100% correct, but once staff check it and it is marked as incorrect, the % will be lower, try reporting anything with nonsense reason, u will see 100% correct report tho