i got an 02 maxima and out of no where yestrday the car wouldnt want to go into gear wen the car was on. Shut the car off and went into every gear fine. fluid was filled and shift linkage was ok so looked at the slave and wen the clutch pedal was released the fork was actually pushed into the slave ccylinder. very weird? when i push in the clutch the fork pushes out/away from the cylnder. i didnt know what else to do so i tried adjusting the pedal and it seemed back to normal next morning same issue and tried adjusting the pedal again and nothing now. wont go into any gear wen car is on

please any help would be great thanks?