I am guessing there a some calculation flaws with the calendar (at least with the peppers). It says to start my tomatoes 2 weeks before my peppers and my egg plant a week before the tomatoes. Eggplant and peppers are started at the same time ... and that is generally 2 weeks before the tomatoes.
The peas also seem to be a couple of weeks too early.
Really? And you have the correct last frost date in for 2018?