[Python] Python Kivy canvas alignment off center

Working on a project, and when I programmatically build a grid layout using prebuilt objects and applying a canvas for a background image, for some reason the image is off center (see image below). I've included the relevant code:

Here is the .py code

card1 = Factory.CardGL()
with card1.canvas:
RoundedRectangle(source=GS_IMG_LSRC, size = card1.size, pos = card1.pos)
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids.DB_MAIN_BL_T_01.add_widget(card1)
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids['card_1'] = weakref.ref(card1)
cardtopgl = Factory.CardTopGL()
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids.card_1.add_widget(cardtopgl)
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids['cardtop_gl'] = weakref.ref(cardtopgl)
cardtopbt = Factory.CardTopBT(text = 'Grocery')
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids.cardtop_gl.add_widget(cardtopbt)
sm.get_screen('sm3').ids.Dashboard_SM_1.get_screen('DB_MAIN').ids['cardtop_bt'] = weakref.ref(cardtopbt)


Here is the relevant prebuilt objects from my .kv file:

<CardGL@GridLayout>:
background_color: 1,1,1,0
canvas.before:
Color:
rgb: kivy.utils.get_color_from_hex('#000000')
RoundedRectangle:
size: self.size
pos: self.pos
radius: [10,10,10,10]
BoxShadow:
pos: self.pos
size: self.size
offset: 5, -5
spread_radius: -7, -7
border_radius: [10,10,10,10]
blur_radius: 10
canvas:
Color:
rgb: 1,1,1,0
RoundedRectangle:
size: self.size
pos: self.pos
radius: [10,10,10,10]
cols: 1
size: dp(Factory.WinCalcs.LB_LTW * .36), dp(Factory.WinCalcs.GL_LTH_C * .6)
size_hint: None, None
padding: dp(0),dp(0)


And here is the outcome, the background should be aligned with the header:

Weirdly Unaligned

Would really appreciate some guidance, kivy is relatively new to me.

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