It is because the value of steem fluctuates. The value of steem is lower right now, so it makes our voting value decrease. You can use this calculator to see how much your vote would be worth based on your steem power in your wallet. https://www.steemnow.com/upvotecalc.html
The one person who commented on buying steem power is right, the more steem power you have in your wallet will increase the value of your votes. However, as the market goes back up and steem's value increases, your vote will be worth more again.
I'm gonna save that link to my bookmark, that's a big help for this issue and at this current steem value. It's a wonderful simple app that rocks. I'm amazed Thanks for sharing. ;)
You're welcome! Now we just have to wait for Steem to go back up in value. Fingers crossed that it happens sooner than later!