I had a UA ticketed flight on AC that was W fare according to United ticket but is reported as AC S fare when I got MP credit (aka 25% PQM, 0 segments).

I have AC ticketed fight (with 5 segments, 3 of them on UA metal) coming up. AC ticket says they are all G fare (therefore 100% miles) but UA website reports their segments as S or G.

Why does one code not equate to the other? Does anyone have any predictions on what rate I will accumulate miles for upcoming AC flight? Also, I would have thought with UA ticketed flight always 100% miles.