Dash drop down menu flickering/not working

I am having problems displaying dropdown menus on my choropleth plot. Currently I have three dropdown menus laying out horizontally on top of the choropleth and displaying okay. But, when I click on them, the dropdown menu texts do not show up, the dropdown boxes show up at random places or flickers. I think it might have something to do with choropleth mouseover having higher priorities than dropdown menu displays. How do I fix that?

app.layout = html.Div(children=[
		html.H1("A Story of Life and Death", style=text_style),
		html.H3("CHSI Cause of Death Visualization, 1996-2003", style=text_style),
		html.Div(children=[
			html.Label('Age Group', style=text_style),
			dcc.Dropdown(
				id='ages',
				options=[
	            {'label': 'Under 1 Years Old', 'value': 'A'},
	            {'label': '1 - 14 Years Old', 'value': 'B'},
	            {'label': '15 - 24 Years Old', 'value': 'C'},
				{'label': '25 - 44 Years Old', 'value': 'D'},
				{'label': '44 - 64 Years Old', 'value': 'E'},
				{'label': '65+ Years Old', 'value': 'F'}
	        	],
				multi=False,
	        	value='D'
	    	),
			html.Label('Ethnic Group', style=text_style),
			dcc.Dropdown(
				id='ethnicities',
				options=[
	            {'label': 'White', 'value': 'Wh'},
	            {'label': 'Black', 'value': 'Bl'},
	            {'label': 'Hispanic', 'value': 'Hi'},
				{'label': 'Other', 'value': 'Ot'},
				],
				multi=False,
	        	value='Wh'
	    	),
			html.Label('Age Group', style=text_style),
			dcc.Dropdown(
				id='cods',
				options=[
	            {'label': 'Birth Complication', 'value': 'Comp'},
	            {'label': 'Birth Defect', 'value': 'BirthDef'},
				{'label': 'Injury', 'value': 'Injury'},
	            {'label': 'Suicide', 'value': 'Suicide'},
	            {'label': 'Cancer', 'value': 'Cancer'},
				{'label': 'Homicide', 'value': 'Homicide'},
				{'label': 'Heart Diseases', 'value': 'HeartDis'},
				{'label': 'HIV', 'value': 'HIV'}
	        	],
				multi=False,
	        	value='Homicide'
	    	)], style={'columnCount': 3}),
		dcc.Graph(id='choropleth')
		])