I get don't get percentages but the absolute number of up and down votes when hovering over the post arrows, both on https://infosec.pub and on https://sh.itjust.works.
I just looked into the preferences for my infosec.pub-account. There's a setting to show percentages which is disabled by default. As I couldn't see percentages when visiting your instance, I'd assume that it's also disabled by default there. Maybe you enabled that setting at some point and forgot about it?
Unfortunately, knowing this makes it harder to ignore downvotes on completely uncontroversial posts where a small minority apparently just want to rain negativity on other people's enjoyment of things. Sigh... social media.