Every 7 kittens born, 6 are normal size and 1 special size!

[Tad Carlucci]

Frankly, I don't see the patterning you seem be saying is there. I do, however, see what looks like random distribution (for normal / not-normal) and your data does appear to support approximate odds of 1-in-7 (14%) that a given box will be not 'Normal' in size.

My feeling is there is more to size than just the Size names (Normal, Tea Cup, etc.). In fact, it appears to me that size is determined as a numeric value (cm, which you can see on some web pages) and the name applied to a range of sizes.

Females typically run smaller than males, so gender is also a factor. I don't think gender biases females to the smaller not-Normal sizes and males to the larger. But, I'd not be surprised if it does. If it does, however, the effect is probably quite small and would require quite a bit more data to begin to show if it does or does not have an effect.