It shows in some comments and posts, but not all.

Yep, forgot to say that it only appears if there is at least a downvote.

Does this affect how my account is viewed on other frontends or like how my account works? I mean I won’t enable it but I gotta ask now.

Yes, it does. It affects how it is viewed in frontends that support the option “Show Bot accounts”. It regulates whether someone will see posts and comments from a bot account or not.

I don’t think I really understand.

I disabled all Show scores, Show upvotes, Show downvotes, Show upvote %, and I don’t think anything really happens. I mean I can still see them all (or some of them), and like now I have all of them enabled but I can’t see who downvoted you, what’s your upvote percentage and your score (although just as I said, this doesn’t happen to all) - I can only see how many upvotes you have.

• Show read posts

Read posts will not appear in your feed. Posts are read as marked if you upvote/downvote, open or comment in them.

• Show upvotes

Shows upvotes in the frontend

• Show downvotes

Shows downvotes in the frontend

Can be overriden by instance setting Enable downvotes (when set to disabled).

Can you clarify what you mean by “I can’t see who downvoted you”? Do you mean as in knowing the accounts that downvoted my comment or the count? Unless you’re a moderator in a community or an administrator, you can’t see the accounts that downvoted somebody. Community mods can only see them within content that is in the communities they moderate. Admins can see any.

• Show upvote %

Works like Show scores, but shows a upvote to downvote percentage instead. You will see a smiley face. Only shows up if there are any downvotes.