Winning Mahjong?

[MackySan]

[SOLVED: ANSWER AT THE BOTTOM]
I've been playing for a while and I keep coming across a hand that should be a winner but it's not?
Character = C
Bamboo = B
Dot = D
(## ## ##) = Tiles put down

4C 5C 6C 7B 8B 9B 5D 5D 6D 6D (3B 4B 5B)

Now I draw a 6D which gives me 4 Sets and a Pair left over. Which is a winning hand right? Why do I have to discard?

Edit: I just had a hand where I took a tile from another player and was left with 3C 3C (All the rest are down), but I have to discard? I only have a pair left I should win?

Edit 2: I overlooked the Yaku rule, this was my problem, I have different rules where I am from ^_^;

[Eclair_Xysha]

Yeah the rules to this majong is very different.... I play with different rules IRL too.

But no matter how many times I'm super close to winning, it's like the NPCs have the upper hand even if the game is still fresh.

So something isn't quite right. Either it's calculated for players to always have the disadvantage.... Or my RNG is really that shitty.

[Krokov]

What is the Yaku rule?

[MackySan]

Go to step 8: Basic Yaku
https://na.finalfantasyxiv.com/lodes...doman-mahjong/

If you want a list of all of them, sadly without pictures:
https://na.finalfantasyxiv.com/lodes...ong/yaku_list/

[Magictrix]

So like this:

https://imgur.com/oLSRRjt