It is useless to compare 2012/2016 to 2020/2024 since it was a lot easier to vote in the latter period. As for 2020 vs 2024, the data are not complete yet and the data bars will be higher for both blue and red, most likely a lot higher.
Or maybe the Repbublicans cheated in 2024. I have no idea if they did, but it's just as valid to say that they cheated in 2024 as it is to say that the Democrats cheated in 2020.