I had a similar experience with purchased soil/compost mix. I have to wonder if these mixes need to age or if the pH is wonky. Leafgro is a good soil amendment, but I'm not sure what percentage it should be. 50/50 would be pretty airy stuff and possibly dry out more quickly.

Have had good success over the years from leafgro. But do remember that if it isn't fully composted it may lockup nitrogen for the first season.