So i have two things, an understanding of why the bug happened and a easy fix.
So the tutorial is just checking if those buttons were pressed in the same combo string, as long as near the end the j.lk is pressed it doesn't matter, the tutorial is not checking for an actual ips for its completion condition.
An easy fix would to make the combo string the following
Launch: c.HP
1st Air String: j.lp, j.lk, j.mk, j.hp (this all chains, but means we used both j.lp and j.lk so both triggers ips)
1st Ground String: s.lk, s.mk, c.HP (this is the same as the tutorial
2ed Air string: Either j.lp or j.lk both trigger ips and just write it out as j.lp or j.lk
I know in other parts of the tutorial Ch2 Lesson 3 - Hit Conformation there is a "lp or lk" in the first lesson, so maybe that same concept could be applied to the j.lp/j.lk ips situation
http://www.twitch.tv/snackysnacks/c/6747830
1st playthrough- Legitimate notation
2ed playthrough- The bug, using j.lp then j.lk which wont trigger ips but give a completion
3rd playthough- Proposed fix, put j.lp in the first airstring so both j.lp and j.lk will trigger ips and put a clause to check for either button at the end of the combo
Nice catch btw.
Edit: Noticed the stream lagged on the j.lp burst but yeah, you get the idea. Sorry i was compiling something and i think my system couldn't keep up
