Sansevieria - folding marks

Hi everyone,

I have this sansevieria for a few good months; Generally speaking is doing well she is replicate herself and so on, but lately I can see some folding marks on some leaves. Is this a bad sign, should I check further the root or simply it's time for the plant to change some of the leaves? Could you please have a look? Thank you, Sara

LE: the soil is pretty dry no sign of excessive moist ... could be a dried plant?
Another hint, could be the wind making the leaves move, generating these marks? A window was open wide for a few hours a few days ago and is pretty close to the plant ...