Power steering harder to turn after topup

Subaru Liberty 1994 115000miles

I just recently topped up my power steering fluid to the correct level and my car's steering has become harder and a little bit jerky. There are no unusual pump noises and my belts appear to be fine. I have checked the system for leaks and aside from slight seepage around a hose join nothing is amiss. Any help would be appreciated as this was not the result I expected to get for topping up the fluid.