Hi, I don't know why the value is different

Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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post in the right category
INCLUDE AT LEAST ONE SCREENCAP IN YOUR POST TO SHOW THE PROBLEM!!!!!!!!
explain the problem clearly
I am following the instruction from lab2a
It looks like you've already done part of Lab 2a and now you're trying to go back and do 1b. It doesn't work that way. You have to go in order 1a, 1b, 2a, 2b, ...
Why are you going backwards?