I was looking further into this last night and part of the issue is a vote worth 0.015-0.019 will round up on screen to 0.02 and look like a 2c vote when it really isn't.
Found out if you click on the link from steemd for when something is upvoted and scroll down towards the bottom it shows the current pending payout of that post/comment. Most important it shows 3 places after the decimal place (.015 for example).
Yes, I was vaguely aware of this, but hadn't looked into it further. Just like our SP is also rounded.