hexes counted twice when drawing line between hexes

Hi,
I'm using the following code to draw a line between 2 hexes in a hexagonal tilemap.
In some cases, the calculated line has the same hex twice instead of the correct hex as seen in the screenshot i'll add below.func oddq_to_cube(hex) > Vector3i:
var q = hex.x var r = hex.y  (hex.x  (hex.x&1)) / 2 var z = q  r var cube = Vector3i(q,r,z) return cube
func cube_to_oddq(hex) > Vector2i:
var q = hex.x var r = hex.y + (hex.x  (hex.x&1)) / 2 var cube = Vector2i(q,r) return cube
func cube_distance(a,b):
var x = a.x  b.x var y = a.y  b.y var z = a.z  b.z var cubesubtract = int((abs(x) + abs(y) + abs(z))/2) return cubesubtract
func Lerp(a, b, t): # for floats
var Lerp = a * (1t) + b * t return Lerp
func cube_lerp(a,b,t):
var cubeA = Lerp(a.x,b.x,t) var cubeB = Lerp(a.y,b.y,t) var cubeC = Lerp(a.z,b.z,t) var Cube_lerp = Vector3i(cubeA,cubeB,cubeC) return Cube_lerp
func cube_round(frac):
var x = round(frac.x) var y = round(frac.y) var z = round(frac.z) var x_diff = abs(x  frac.x) var y_diff = abs(y  frac.y) var z_diff = abs(z  frac.z) if x_diff > y_diff and x_diff > z_diff: x = y z elif y_diff > z_diff: y = x z else: z = x y var round_cube = Vector3i(x,y,z) return round_cube
func Line_draw(Lstart,Lend):
var N = cube_distance(Lstart,Lend) var a_nudge = Vector3i(Lstart.x + 1e6,Lstart.y + 1e6,Lstart.z  2e6) var b_nudge = Vector3i(Lend.x + 1e6,Lend.y + 1e6,Lend.z  2e6) var results = [] var step = 1.0/max(N,1) for i in range(N + 1): results.append(cube_round(cube_lerp(a_nudge,b_nudge,step*i))) return results
var cubepath = Line_draw(startcube,endcube)
for i in cubepath.size(): var id = cube_to_oddq(cubepath[i]) print(id) path.set_cell(0, id, 1, Vector2(0, 0)) print("end")
(13, 15)
(13, 15)
(14, 17)
(14, 17)
(15, 18)
(15, 18)
(16, 20)
endis what is printed.
I know the code is messy, i'm new to programming and most of my code is frankensteined from tutorials.