Yeah I was going to ask if you used a GUC, since that ends up going into G and people have reported issues of having to request the miles from the original ticket when it is reissued from econ into buisness G with a cert.

I could understand it being G if it is delta marketed, but then you should earn per DL which you get credit for G. May be a mistake in DL's system and you just have to call and ask them to fix it.