[SOLVED] Mouse's Target giving incorrect input?

I've struggled with this issue for over a week now and my project has halted completely. The mouse object is giving a wrong object as its target whenever I click. I made this little video demonstrating the issue, alongside with the exact place in this video.

In my original project I have tried different ways to mimic the Target property, none of them has worked.

function mouse:getTarget(directory)
--  local ray = Ray.new(realCamera.CFrame.p,realMouse.Origin.lookVector * 2000)
--  local part = workspace:FindPartOnRay(ray)
--  drawRay(ray)
--  return part

--  local mouseRay = realMouse.UnitRay
--  local ray = Ray.new(mouseRay.Origin,mouseRay.Direction * 2000)
--  local part = workspace:FindPartOnRay(ray)
--  drawRay(ray)
--  return part

--  I guess I just gotta experiment: use WorldToViewportPoint on all clickable objects and check if the mouse is on it on the xy-plane, if multiple ones are found it gives the one with the shortest distance
--  directory = directory or workspace
--  
--  local closest,dis = nil,math.huge
--  local children = directory:GetChildren()
--  for n = 1,#children do
--      local child = children[n]
--      if child:IsA("BasePart") then
--          local viewportPoint,isVisible = realCamera:WorldToViewportPoint(child.CFrame.p)
--          if isVisible then -- else just ignore
--              local delta = Vector2.new(viewportPoint.X - realMouse.X, viewportPoint.Y - realMouse.Y).magnitude
--              if delta < dis then
--                  closest = child
--                  dis = delta
--              end
--          end
--      end
--  end
--  return closest
end

Where "mouse" is a custom class and realMouse the actual PlayerMouse object. The reason I cannot really use the Target property even if this issue didn't exist, is because its distance is too limited for my needs. I would be using the Ray solution but the mouse's Hit property is also giving incorrect results, which must be connected to the Target issue.

I believe the camera's Focus property is causing this all but I have no idea why. This is how I'm updating the camera, as well as setting the Focus property:

function camera:update()
    if self.subject then
        realCamera.CFrame = self.subject.CFrame * self.rotation * CFrame.new(0,0,self.distance)
        realCamera.Focus = realCamera.CFrame
    end
end