Card Distribution

[SuzakuCMX]

They were all around 17%. AKA working as intended.

[Phenidate]

This statement ignores the dry spells of cards - over 200 card draws they are around 17% sure, but in order you're seeing a lack of certain cards for on average around 19 draws.
This could just be a bole, arrow, or balance you just won't see for two or three encounters. At all.

Consider the fact that your chance of not drawing a given card is 5 in 6. To not draw a card in say, 3 draws is (5/6)^3 - which is about a 57% chance.
(5/6)^19 is ~3%.

These dry spells happened 14 times during the test - which is pretty dang crazy for something that only has around 3% chance of happening. Yesterday I apparently should have been playing the lottery.

[Alahra]

This statement ignores the dry spells of cards - over 200 card draws they are around 17% sure, but in order you're seeing a lack of certain cards for on average around 19 draws.
This could just be a bole, arrow, or balance you just won't see for two or three encounters. At all.

Consider the fact that your chance of not drawing a given card is 5 in 6. To not draw a card in say, 3 draws is (5/6)^3 - which is about a 57% chance.
(5/6)^19 is ~3%.

These dry spells happened 14 times during the test - which is pretty dang crazy for something that only has around 3% chance of happening. Yesterday I apparently should have been playing the lottery.

The game's RNG has always been seen as fairly swingy, as any serious Crafter or Gatherer will attest to. It seems to get "stuck" on certain number ranges at times. It probably has something to do with the way it's seeded.

[Phenidate]

Then that's an issue with how they're drawing random numbers then. Was there something wrong with the well tested Randoms that comes with nearly every programming language?

[HeavensSword]

Then that's an issue with how they're drawing random numbers then. Was there something wrong with the well tested Randoms that comes with nearly every programming language?

I'm willing to bet there's nothing wrong with how they generate random numbers...

The problem you are having is that it is random.