Deforming mesh causes mesh tearing

Hello, i am attempting to create a deformable planet, which works when i first implemented the code but when i tried to optimize the code a bit it causes "tearing" in the mesh. Here is the code i am currently using (the commented out parts is older version which worked fine but was incredibly slow).

 public void DeformTris (List<int> tIndexes, float amountVertical){
     List<Vector3> vertecies = new List<Vector3> ();
     Vector3[] tempMesh = currentMesh.mesh.vertices;
     int[] triangles = currentMesh.mesh.triangles;
     foreach (int ti in tIndexes) {
         //vertecies.Add (tempMesh [triangles [ti * 3]]);
         //vertecies.Add (tempMesh [triangles [ti * 3 + 1]]);
         //vertecies.Add (tempMesh [triangles [ti * 3 + 2]]);
         Vector3 vert1 = tempMesh[triangles[ti * 3]];
         Vector3 directionToCenter = this.transform.position - vert1;
         Vector3 newPosition = vert1 + directionToCenter.normalized * amountVertical;
         tempMesh[triangles[ti * 3]] = newPosition;
         Vector3 vert2 = tempMesh[triangles[ti * 3 + 1]];
         Vector3 directionToCenter2 = this.transform.position - vert2;
         Vector3 newPosition2 = vert2 + directionToCenter2.normalized * amountVertical;
         tempMesh[triangles[ti * 3 + 1]] = newPosition2;
         Vector3 vert3 = tempMesh[triangles[ti * 3 + 2]];
         Vector3 directionToCenter3 = this.transform.position - vert3;
         Vector3 newPosition3 = vert3 + directionToCenter3.normalized * amountVertical;
         tempMesh[triangles[ti * 3 + 2]] = newPosition3;
     }

     /*for (int vertex = 0; vertex < tempMesh.Length; vertex++) {
         if (vertecies.Contains(tempMesh [vertex])) {
             Vector3 directionToCenter = this.transform.position - tempMesh [vertex];
             Vector3 newPosition = tempMesh [vertex] + directionToCenter.normalized * amountVertical;
             tempMesh [vertex] = newPosition;
             //break;
         }
     }*/
     currentMesh.mesh.vertices = tempMesh;
 }

My idea was that i already had the triangle index(s) from a raycast and so i could manipulate the vertices of the triangle without iterating through the few thousand vertices of the entire mesh. This has cause a problem in the mesh (shown in the picture below) and I'm not quite sure if there is a way that i am able to solve it without splitting the planet up into multiple objects, which causes a bunch of problems anyway. If anyone could help me at least identify why this "tearing" or splitting of the mesh is happening it would be most appreciated, thanks and have a great day.