Hi @vonpetro, I understand that this doesn't make much sense on the face of things. Your number skills are impressive :)

There are two key reasons for the scenario you describe to occur:

1. The upvoter has a deminished voting power (this decreases as you vote on more posts & regenerates at a rate of 20% per day.)
2. The upvoter has chosen to give their vote a lower weight using the slider (this option becomes available once you have around 500SP)

The reason a user might choose to use the slider would be either to preserve voting power, or give a partial reward (liked it, not loved it.)

I hope this helps.