I am new to options trading and try to replicate one simple algo similar to Bull call spread.

First, I have tried to do something very simple: buy ATM call option at the expiration closest to 90, buy above or equal 90.

I don't get any error, but I don't understand why algo buy options on 2021-10-05 and not imediatelly on the begining of the period ( 2021-05-01 )

This is probably the noob question, but can't figure out the answer.