Turned fan leaves

can anyone tell me why this is happening? What does it mean? In the picture you can see how the fan leaves have turned to where they are up and down and not flat.... Any info helps thanks

Some of those leave are looking pretty dark, looks like you have a bit too much Nitrogen in there

when leaves start twisting it usually down to PH. looks also like you need to give them some MG, As some of the leaf tips are turning upwards