Jumping with raycasts causing issues?

I have the following code which handles jumps and double jumps:

 void JumpingControls()
 {
     //If space is pressed and isGrounded
     if (Input.GetButtonDown("Jump"))
     {
         if (isGrounded && !attacking)
         {
             animate.SetBool("Jump", true);
 
             //set grounded to false
             isGrounded = false;
 
             //Apply jumpForce upward
             GetComponent<Rigidbody>().AddForce(Vector3.up * jumpForce, ForceMode.VelocityChange);
 
             //allowed to double jump
             doubleJump = true;
 
         }
         else
         {
             if (doubleJump)
             {
                 animate.SetTrigger("Double");
                 //not allowed to double jump
                 doubleJump = false;
 
                 //Apply jumpForce upward
                 GetComponent<Rigidbody>().AddForce(Vector3.up * jumpForce, ForceMode.VelocityChange);
             }
         }
     }
 }
 
 void CheckIfGrounded()
 {
     if (isGrounded)
     {
         animate.SetBool("Jump", false);
         doubleJump = false;
     }
 }

This code works great when I am detecting if I am grounded or not, but only with this collision code:

 void OnCollisionEnter(Collision col)
 {
     if (col.contacts.Length > 0)
     {
         ContactPoint contact = col.contacts[0];
         if (Vector3.Dot(contact.normal, Vector3.up) > 0.5f)
         {
             isGrounded = true;
         }
         else
             isGrounded = false;
     }
 }

But there is issues with this code, if i collide with most things, it sets my isGrounded script to false, which doesnt allow me to jump, so I want to handle jump using a raycast pointing down from my feet but the issue is when I jump with the raycast code, it exits the Jump state immediately and doesn't allow me to double jump even though it detects that I am not grounded correctly.

I need a second pair of eyes on this because I am stumped, any help appreciated, here is the raycast code:

 void DetectCollision()
 {
     RaycastHit hit;
     float dist;
     Vector3 dir;
 
     dist = 1.5f;
     dir = new Vector3(0, -1, 0);
 
     //edit: to draw ray also//
     Debug.DrawRay(transform.position + new Vector3(0, 1.0f, 0), dir * dist, Color.green);
     //end edit//
 
     if (Physics.Raycast(transform.position + new Vector3(0, 1.0f, 0), dir * dist, out hit, dist))
     {
         isGrounded = true;
     }
     else
     {
         isGrounded = false;
     }
 }