Resistance noticeably heavier on the hoods compared to sitting upright - Flux

Hi. My neighbour has lent me his Flux. He found the resistance too hard and bought a Kicker. I have set my FTE at 175. On the Tacx power function I have found that the resistance is significantly harder when on the hoods and drops when compared to sitting upright. I haven't tried any training aps, but I suspect its going to be the same. Anyone know why that would happen?