Slot games are always about chance. The same machine or online slot can go a long time without paying out, and then suddenly surprise you with a big win. If the game brings enjoyment and stays within reasonable limits, that’s already a good outcome. And a x312 win is definitely something to be happy about. It's nice to beat the odds this way. And hey, with $2 as a bet, it's actually decent money you've won. Congratulations!