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Because you have low voting power.....check out, you will be clear.
https://steemit.com/steemit/@stevenomole/maximise-your-upvotes

How to increase my voting power?

I am not very sure.........but one way is sure, stop upvoting for 3-5days.

But sometimes I am getting it!

What stevenmole says is true. Right now your vote is at zero.... I believe it's worth fractions of a cent. Check your stats.

cool....discovered stemnow this week, it has been a blessing

I just started yesterday, hope will increase everything soon.