i have a Giant Escape City Hybrid. I had th stem swapped out to help with pain in my hands. Previous to that the guy at the lbs moved my seat forward

I told him everything else was fine, the only problem was my hands.
I rode the bike 20 miles saturday after I moved the seat back about one inch and my hip flexors are sore, very sore. Is this a symptom of the seat being too far back?