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It is because your voting power is way down.Click here https://steemd.com/@steemitvkey24

See the top green bar. It is below 50 percent. That is why you having problems voting. Stop upvoting so much. If you want my help with more stuff. Click here to go to my discord societies server. https://discord.gg/svku7G

VP ~> 100% in 2d 13h 54m | 2018-06-29, 14:43
Followers 262 | 202 following
Reputation 30.598
Post Count 8 posts | 159 comments
Vote Count 125 votes | 172 received
Voting CSI [ NA ] ( 16.54 % self, 127 upvotes, 72 accounts, last 7d )

You see your voting power won't get back to 1oo% for two days thirteen hours and 54 minuets.

Account Value 21.39USD|18.36EUR

Reward Balance 0.000STEEM|0.000SBD
Account Balance 13.645
Savings Balance 0.000STEEM|0.000SBD
Vesting Balance 0.000STEEM

Vesting Shares 3.001STEEM|0.006MVests
Received Vesting Shares 0.000STEEM|0.000MVests
Delegated Vesting Shares 0.000STEEM|0.000MVests

Withdrawn 0.000STEEM|0.000MVests
To Withdraw 0.000STEEM|0.000MVests
Vesting Withdraw Rate 0.000STEEM|0.000MVests

Use Ctrl + and see that it is your post displaying the votes you got and the percentage of voting power people used to upvote your post.
@steemitvkey24 (30).png