Shoot Al, all my mushrooms do that.
Grinch,
I will usually see see one or two scrunched up doing self-propagation, but when they all do it at one time, it generally means something is going on with the Ph or the Ca/Kh is out of balance. Rapid changes to temp can also mark them curl up. As you observe your tanks inhabitants and get to know their body language, they will tell you what is going on with the water they are in.
If your parameters are in line and not experiencing any major temp swings they will come around. Shrooms are very hardy, not to worry!