Huge User Rating Drop?

I know ratings are a bit quirky, but any reason why a film could go from 6.6 to a 3.9 with hardly any new ratings added? It's almost like the math switched mid-stream. I know we also had a bunch of overseas "1" scores before the film was even available elsewhere, but I know that's par for the course with online ratings. We're more interested to why the 2.6 drop overnight could happen. The film's page is here for reference: https://www.imdb.com/title/tt14463198/ratings/?ref_=tt_ov_rt (and full disclosure, I'm one of the filmmakers).