IMDb rating

Hello. We made a little zero budget film: https://www.imdb.com/title/tt32474968/ The rating on IMDb is 2.1 mostly because it was rated based on a trailer uploaded on a channel filled with haters, BUT, there is also 3.6 "unweighted" rating which we don't know what it means? We calculated all the ratings together and it does come to around 3.6 NOT 2.1, it's like IMDb does not want to update it? We would understand the bad rating as the movie is far from the best but, because those who rated it did not actually watched it and people who did watch on youtube rated it more positive: channel with 16.000 views has 94% positive review (239 likes, 18 dislikes!) on uvo.tv 4.6 out of 5 Which makes it clear the IMDb was attached by the haters of the trailer. Anyway, question. Why IMDb does not changes to 2.1 to 3.6 rating? Based on the other sites rating the 3.6 make it more realistic. If the YouTube got 18 likes and 239 dislikes, we would understand it. Now we are all confused.