Messed up random placement script, random X coordinate works, Z - not so well, any guesses? [Solved]

Hello, I'm currently working in a little RNG-based system to place objects within a specific range (in this case, as long as it is in bounds of a specific part), this means that the X and Z are going to be random, but the Y is going to be constant.

My expected result is for parts to be scattered randomly around the selected field, but I messed something up, and for some reason, random X works, and while Z kind of does, the differences in Z coordinates are very minuscule.

Result of my current script (image link): https://cdn.discordapp.com/attachments/482924987288780801/765527140174528542/unknown.png

Current script (generation happens in a client-sided ModuleScript):

generator.generate = function(Slide, Amount)
    local SlideSpawn = Slide:FindFirstChild("Spawn");
    local SlideEdgeX = Vector2.new((SlideSpawn.Position - Vector3.new(SlideSpawn.Size.X/2, 0, 0)).X, (SlideSpawn.Position + Vector3.new(SlideSpawn.Size.X/2, 0, 0)).X);
    local SlideEdgeY = Vector2.new((SlideSpawn.Position - Vector3.new(0, 0, SlideSpawn.Size.Y/2)).Z, (SlideSpawn.Position + Vector3.new(0, 0, SlideSpawn.Size.Y/2)).Z);
    for i = 0, Amount do
        local rng = Random.new()
        local ToPaste = Instance.new("Part");
        ToPaste.Size = Vector3.new(1, 1, 1);
        ToPaste.Anchored = true;
        ToPaste.Parent = Slide;
        local RanX = rng:NextNumber(SlideEdgeX.X, SlideEdgeX.Y);
        local RanZ = rng:NextNumber(SlideEdgeY.X, SlideEdgeY.Y);
        print(SlideEdgeY.X, SlideEdgeY.Y);
        ToPaste.Position = Vector3.new(RanX, SlideSpawn.Position.Y, RanZ);
    end
end