I had a dead battery in my Ranger yesterday, so I pushed it to the barn to hook it up to the battery charger, steering it while we pushed. However, I ran into a problem after the battery was charged and I tried to leave. My truck was steering a little bit hard. I checked the power steering fluid and saw that fluid had spurted out of the reservoir. Some fluid was on the ground and some was on my engine.

While driving it on the road yesterday and today, my truck continues to steer hard when taking corners. I put some power steering fluid in it, but that didn't really help.
I don't know why it is steering hard like this. Did I damage the power steering system by steering it when the truck was not running??
Any help would be much appreciated. Thanks.