My Nightmare Story Mission Difficulty increased with update?

I have been working a story mission hard over the past week. now 13-1 went from level 20 to 22!!! and 12-2 went from 20 to 21. With max created survivor at a 17 how is it even possible to actually make it HARDER? Why was this done? And did it happen to everyone?
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Haven't played story missions for a while so I am able to compare stats before and after update. Only episodes 12 & 13 left on nightmare for me and their recommendations are still the same.
Btw nice nick...KRS is one of the best.
So for Episode 13 The Factory nightmare mode is recommended survivor level 22?
It might be even higher for the following missions.
I tried a couple of times, make it to the finish line but can't kill the last batch.
Geezus!!!! Lol
BBQ with lvl 22 fattie is easy. It's episode 12-3 in Nightmare mode. By the time you get to the fatty on this mission, one of your three survivors can be seriously injured.
Tammy
It wasnt a nightmare getting past them as long as you have lvl 18 survivors with lvl 21 gears with one interrupt so that you can interrupt one of the fatty burning lvl 22 walkers with a range survivor while one guy is opening the gate.
I don't want to fully give the strategy away so you guys can have some fun with it but these two first moves can potentially give you a great start.
Good luck!