Why is it not always possible to increase someone's karma?

Question

Habr

I liked the post, I go to the author's profile (the page is fully loaded), I press to increase karma (once), then the following happens randomly: either karma increases, or nothing happens. In the second case, by pressing again, either nothing happens again, or the karma is reduced by one. Previously, at least a message was displayed that I voted for this author, but now it turns out that I screwed up a good person by lowering his karma, although I acted just the opposite.
Is this by design or am I missing something?

PS Opera 12 (Win7, MacOS)

Answer 1

Yeah, that's why I have so many minuses!!!

Answer 2

Give a link to the profile of the person who was spoiled and tell me what is displayed for you - maybe js is buggy or the browser cache is naughty

Answer 3

Have you tried Opera?

Answer 4

Perhaps this is the point :
Karma can be increased and decreased (this can be done daily, hourly, but not more than once every seven minutes ).
However, we open several worthy authors in a row - we try to give everyone what they deserve. Bummer: someone goes up, someone stays the same (in theory, according to the above rules, only the first one would get +1, since the rest are clearly open before seven minutes).
Where did the dog dig?

Answer 5

Better contact support .

Answer 6

This seems possible if the person you want to increase karma for has previously increased karma for you. Apparently, this is done to exclude mutual karmonakruvanie. Came across this once. But so that several times ...