Object stops moving foward when lerping

I am making an infinite runner, but when I try lerping between lanes, the character stops moving fowards, do the lerp and then keeps going. How can I make it lerp while still moving? Sorry about some var names, when I started coding I used to use my native language, but I stopped doing that and I'm still changing their names to english.

Code (CSharp):

1.  void DoLerpLeft()
2.     {
3.      
4.         isLerping = true;
5.         timeLerpStarted = Time.time;
6.  
7.         startPos = personagem.transform.position;
8.         finishPos = personagem.transform.position + Vector3.left * lerpDistance;
9.  
10.     }

Code (CSharp):

1. void Movimenta()
2.     {
3.         Vector3 movimenta;
4.  
5.         movimenta = new Vector3(0, 0, personagem.velocidade);
6.  
7.         personagem.transform.position = personagem.transform.position + movimenta;
8.     }

Code (CSharp):

1. private void FixedUpdate()
2.     {
3.         Movimenta();
4.  
5.         if (isLerping)
6.         {
7.             float timeSinceStarted = Time.time - timeLerpStarted;
8.             float lerpPercentage = timeSinceStarted / changeLanesTime;
9.  
10.  
11.             personagem.transform.position = Vector3.Lerp(startPos, finishPos, lerpPercentage);
12.  
13.             if (lerpPercentage >= 1.0f) isLerping = false;
14.         }
15.     }