Den. with curly leaves

[gngrhill]

I got this Den. recently and I wonder if anyone can tell me what causes the leaves to curl longwise so they make a tunnel shape. Those leaves are on two PBs in the center of the clump. The rest all seem to be fine. The roots I can see look ok, but I have not disturbed the plant to look at all the roots because I'm waiting for it to be done blooming. Thanks for looking.

[No-Pro-mwa]

Not sure, maybe got to dry at a certain time in it's growth. I have some Catt's that will have leaves that curl a bit but some of it is natural. I think anyway.