[Kivy] Weird spacing in grid layout

[test]

Hello!
I am trying to make a form using kivy. Here is what i tried.

class MyMainApp(App):
	def build(self):
		x = 0.3
		x1 = 0.6
		y = 40
		lab0 =		custLabel(text='Date: ')
		datee =		DatePicker(size_hint=(x1, None), height=y)
		lab1 = 		custLabel(text='Patient ID: ')
		ID = 		custTextInput()
		lab2 = 		custLabel(text='Name: ')
		namee = 	custTextInput()
		lab3 = 		custLabel(text='Age: ')
		Age =		custTextInput()
		lab4 = 		custLabel(text='Informant: ')
		informant = custTextInput()
		spin =		Spinner(text='Parent', size_hint=(x, None), height=y, values=['Parent', 'Grand parent', 'Spouse', 'Neighbour', 'Friend', 'Other relative'])


		#informant relation and name
		box = BoxLayout(orientation='horizontal', size_hint=(1,0.8))
		box.add_widget(informant)
		box.add_widget(spin)

		gl = GridLayout(cols=2, size_hint=(0.9,0.8))
		gl.add_widget(lab0)
		gl.add_widget(datee)
		gl.add_widget(lab1)
		gl.add_widget(ID)
		gl.add_widget(lab2)
		gl.add_widget(namee)
		gl.add_widget(lab3)
		gl.add_widget(Age)
		gl.add_widget(lab4)
		gl.add_widget(box)

		return gl

But, when i run it, i am getting a space between the last two rows for some reason.
https://drive.google.com/open?id=1mx288A...O_paK8HXW1

Can someone please tell me how i can get rid of it?
Also, can i put this grid layout in a tabbed panel? (I tried to by doing this)

tp = TabbedPanel()
tp.content = gl
return tp

But it isnt showing any widgets inside.
Please advice :)