Same person on multiple accounts.

@seb1337
What The-Fall is saying is that people are using other accounts to self vote.

@seb1337
Many active users have done this like:
-DAVPPK
-Frankomisko
-Dooose

Also some people have used many accounts to spam like:
-Mystery Guest (Uses many accounts who's names are 3-digit numbers like: 123, 124, &125)

@seb1337
They vote on there own creations.

@andrewdavidloftus
That "mystery guest" is frankomisko.

User 907 posted on the post Simon made about self-votes and made a very direct reference to his being frankomisko.