Beginners have a problem

Good afternoon.
I am a novice at the hub At the time of this writing, I have habrakarma = 20, and harbasil 28.
I can write to any blog, but I can’t vote for topics, users’s karma, or comments.
I thought it was my only case and did not give it attention. Since the main thing is the ability to write without restrictions.
But today a letter fell in my mail in which another new user asks why he can’t vote, although he wrote a post and gained +7 karma. After that, I talked with another habraznakom. He has a different situation. He on a habr several months and earlier could normally vote. Then his karma dropped to -1, then again rose to a positive mark and he was able to vote again. But not long ago, his fall in the red again and reincarnation in the black (not long ago) again, but now he has the same problem. With positive karma, he can not even vote for the topic.

I think this is some kind of problem with Habr. Creators - clarify the situation.

If someone is faced with a similar - unsubscribe.
UPD I 'm sorry. moved to the right blog