Is this a new defense from bots? Why does it affect established user accounts like mine? Has anybody else also noticed this?
The karma doesn't change immediately in my experience.
But the FAQ does say some votes aren't counted:
> Roughly, the number of upvotes on their posts minus the number of downvotes. These don't match up exactly. Some votes are dropped by anti-abuse software.
It does if I upvote from the clearnet. I have just done it, and your karma immediately increased by one, from 4297 to 4298.
/shrug
I use Mullvad.