3000 listens missing.

Hi, I recently ported my lifetime stats after getting a plus subscription.
I have around 8,000 listens according to Spotify’s files. Last.fm is almost accurate with around 7,800 listens but stats.fm still insists on saying it’s 5,1000~. Missing the mark by around 3000 listens. I’ve tried re-uploading the files but it still says the same thing.