Hi @renodakota,
It is because of the Steem price and your Steem Power.
At the current Steem price ($0.97) your 100% upvote with your 31.625 SP worth less than a cent (about $0.007). It is still added to the person's Potential payout but you can't see it.
You would need at least 35.2 SP to have an impact of $0.01.
I know it's sounds discouraging but if the Steem price will go up or you will make more SP, either way your upvotes will worth more in the future.
Okay cool. My vote used to worth a couple of cents, so it didn't make sense. Thanks for the response, I really do appreciate it!