Muscle fatigue many days after hiking

I recently went on a 2-week long hiking trip. Most days involved intense hiking of 7-11 miles and an elevation change of at least 1000ft across rough ground. Needless to say, that isn't my normal activity level, but I've done this sort of trip before (both at my current fitness level and when more fit). On the hikes during these two weeks, I experienced the expected muscle exhaustion that is associated with depletion of glycogen in the muscles. As in the past, the wobbly-leg syndrome improved some with resting and eating a snack, and after a night's rest I was good to go again the following morning.
After previous long hiking trips, I've returned home feeling extra strong with improved cardio and muscular endurance, and was looking forward to using this as a jumping off point for a summer fitness plan. But, this time, I've been home for four days and my muscles are more tired than normal instead of less tired. When doing simple daily tasks like climbing a flight of stairs, my legs feel leaden - as if I'd done a long hike today instead of several days ago. To be clear, I am referring to muscle fatigue, not any pain that would indicate an injury.
I've never experienced muscle fatigue so long after hiking, and am curious if any of you have. How long did it take you to recover? After recovery, did you ever get to the point of feeling stronger than before the intense period of exercise? And, does anyone know what would cause this? It *feels* just like glycogen depletion, but I don't see how that could possibly be the case after several days of normal eating and activity levels.