Button wont work when character is on ground

Hello. I have checked everywhere for this answer, and I haven't seemed to find a solution for my problem.

This is my code:

 function Start () {
 
 }
 
 function Update () {
 if (Input.GetButton("Fire1")){
     animation.CrossFade("Hit");
 }
 
 else if (Input.GetButton("Fire2")){
     animation.CrossFade("Kick");
 }
 
 else
 animation.CrossFade("Rest");
 }

Whenever I click the Fire2 or Fire1 buttons, aka 'p' or 'r' keys, I get no reaction from the character when it is on the ground. HOWEVER, when my character is falling, or when it is in the air, the actions work perfectly.

Does someone have an answer to this problem?

Thanks.