Normal...
When sailing to weather with jib only, all of the sail's resistance to the wind is forward of the center of effort for the boat. This tries to push the front of the boat toward the leeward side, or produce lee helm. If you were on main sail alone, most of the resistance would be aft of the center of effort, pushing the stern of the boat to leeward, or producing (LOTS of!) weather helm. A balanced plan with the sail and jib will generally produce slight weather helm, but a much more controllable boat. My experiences with my H25 show that I can sail off the wind on the jib alone, but if I try it with main only, I tend to round up. Across the wind, I can use either sail fairly easily. To go to weather, I really need to put up at least a reefed main to be able to make headway. If I try to sail with only one sail when going to weather, I'll end up going more sideways than forward!--Jon BastienH25 'Adagio'