Are winners random? (or streaky)?

Hi all, I just had a wow moment that made me ask this question.

I just had the same person win two giveaways with 394 and 438 entries that ended 1 minute apart. The probability of that happening is 0.0000058 assuming randomness (or pseudo randomness w/ an algo and seed).

I've also noticed that when I win, I also often win in bunches. That can happen with randomness for sure, but it feels a bit clustery sometimes.

I'm curious, do any of you get the feeling that maybe winning isn't random on a per giveaway basis, but maybe some days you're streaky? Just curious.

And I'm not insinuating anything improper is going on, I'm just trying to understand if something about the selection algorithm might make streakiness more probable? Is it a simple rand(n), where n is # of entrants, or is it perhaps somehow tied to particular user id's on certain days that makes winning more probable? If it's been explained somewhere that'd be cool to read. thanks

EDIT: Link to Poll as provided by rred (thanks)
http://strawpoll.me/6225603