If you just moved in, I'm sure Kai pooped indoors because he is is not familiar with his new surroundings or new poop spot. How long have you been settled in?

Try the methods you used when you first potty trained Kai. When you see he has to go, take him outside, say the word and then praise.

I think he may have onyl done this because he had his old poop spot with the old house and now he's a little confused on where to go.

I could be wrong of course