If later text shows that my initial reading was incorrect due to missing context or because I misread their starting point, yeah. For example, if something starts off sounding positive but context shows it is actually a dogwhistle I had not come across before I will go back and correct my votes. It rarely takes even a minute to fix a dozen or so in a chain.

It isn't so much that I think my individual votes matter, but because I don't like knowing I gave a positive interactions with that thing.

Same thing if I read something as a negative and find out I was wrong, gonna flip those to upvotes!

Sometimes. I might get halfway through the comments and see that someone has shared something from their post history that paints them in a different light.

My up/down votes gets as much attention as their importance warrants. None at all.

I don't often change upvotes. Sometimes I will go back and upvote things after I better understood the poster's point.

Downvotes tho ... I review my downvotes at lemvotes.org. I haven't changed many, but I do reconsider them.

Rarely.

Most likely reason is to upvote a contrarian reply to my own comment that I was too salty about to upvote in the moment.

I already have a pretty good sense of bad faith arguments, having been online for far too long.

Idk, it feels a lot of conversation about difficult to grasp topics are followed by a lot of Dunning-Kruger comments, even here on lemmy. Sometimes it's about related topics that a person know, so their comments seems reasonable, but after a search or a harder look, I stop upvoting or I can even downvote their comment, but sometimes I just ignore if I don't even remember the original conversation.

Who cares that much

If I think the content is a net positive for Lemmy you get a upvote, even if I disagree, even if I don't like you.

So that means even if someone later reveals themselves to be an asshat, they are still adding to Lemmy's ecosystem and get to keep their upvotes.

Update: but I'm not a saint, if someone is downvoting me I'll downvote them right back

No because when I upvote someone it usually means I agree with their point. Disagreeing later doesn't change the initial agreement.