The official rankings on the UFC website have both Overeem and Arlovski as number 3 contender at heavyweight.
Noting that rankings are an aggregate from a number sources, could that make this possible? I believe that there is an even number of voting panelists (26?) so it's even more possible. You would think 25 would be a nicer number. If votes tally up and two fighters are even do they just get ranked the same? Could we have two number one contenders?
Or is it just a UFC fuck up? 
Well it is possible to draw in bullshit, so I'd say yes.
How dare you question the UFC's top men?
The only rankings which are bad is the P4P imo.