Deco problem

My Deco was almost finished - just had half of second sleeve to make and collarband... and then I discovered in a daylight (I usually knit in the evening since I don’t have time to knit during daytime) that in mid-back, where I changed the skein, it is in totally different colour!
So my Deco now is again ripped off until mid-back...

Note to self - always check yarn, before knitting, in daylight.

Grrr....