Why my bim file doesn't match to my ped file as the Plink documentation suggests?

Plink documentation about .bim says the columns 5 and 6 are the Allele 1 and Allele 2 respectively. The documentation about the .ped in turn, says "...The first six fields are the same as those in a .fam file. The seventh and eighth fields are allele calls for the first variant in the .map file ('0' = no call); the 9th and 10th are allele calls for the second variant; and so on.."

I've simulated a dataset as per:

$$plink1.9 --simulate ds1.sim acgt --out ds1 ...$$ head ds1.bim
1       null_0  0       1       C       T
1       null_1  0       2       A       C
1       null_2  0       3       C       A
1       null_3  0       4       T       A
1       null_4  0       5       G       C
1       null_5  0       6       T       C
1       null_6  0       7       T       C
1       null_7  0       8       G       C
1       null_8  0       9       C       G
1       null_9  0       10      T       A

Than I converted it to plain PED and MAP:

$$plink1.9 --bfile ds1 --recode --out ds1 ...$$ head ds1.ped > ds1.head.ped