Side: Red corrected line

So I was rereading Side:Red and got to this

じゃあ、信じてないの？
ん？いや、そういうわけじゃないよ。でもまあ、想定したことがなかった事態でもないから

I always thought there was something strange about the original translation for this part and for some reason it stayed with me while reading the book the first time. One year later, I actually realised there was a second negation missing, while 想定 and 事態 had been grouped together.

Then you don’t believe me?
Hm? No, that’s not it. But, you see, it’s not something I never expected either.

There we go, got myself an awkward translation.