Only 1 of multiple shapes added to geodataframe

Question

I'm working with Jupiter and ipywidgets and Ipyleaflet , trying to draw polygons on a map and saving to a geodataframe. I have the following in a notebook cell:

myDrawControl = DrawControl(
rectangle={'shapeOptions':{'color':rect_color}},
        polygon={'shapeOptions':{'color':poly_color}}) #,polyline=None)

def handle_draw(self, action, geo_json):
    handle_interaction("action ")
    handle_interaction(action)
    handle_interaction("geojson ")
    handle_interaction(geo_json)
    handle_interaction("geojson ")
    handle_interaction(geo_json['geometry']['coordinates'])
    global rects,polys
    global gdf2 

    coordinates = geo_json['geometry']['coordinates'][0]
    polygon_coordinate_tuples = [(lon, lat) for lon, lat in coordinates]
    handle_interaction("tuples ")
    handle_interaction(polygon_coordinate_tuples)
 
    if geo_json['properties']['style']['color'] == '#00F':  # poly
        if action == 'created':
            handle_interaction(" created")
            polygon_geom = geometry.Polygon(polygon_coordinate_tuples)
    
            handle_interaction((polygon_geom))
            # Create GeoDataFrame if it doesn't exist
            if gdf2 is None:
                gdf2 = gpd.GeoDataFrame(geometry=[polygon_geom])
            else:
                
                handle_interaction(" exists GDF2")
                gdf2 = gdf2.append({'geometry': polygon_geom}, ignore_index=True)
            
        elif action == 'deleted':
            polys.discard(polygon)
    if geo_json['properties']['style']['color'] == '#a52a2a':  # rect
        if action == 'created':
            rects.add(polygon)
        elif action == 'deleted':
            rects.discard(polygon)
myDrawControl.on_draw(handle_draw)

I printed out the coordinates when selected using the next cell:

action 
created
geojson 
{'type': 'Feature', 'properties': {'style': {'stroke': True, 'color': '#00F', 'weight': 4, 'opacity': 0.5, 'fill': True, 'fillColor': None, 'fillOpacity': 0.2, 'clickable': True}}, 'geometry': {'type': 'Polygon', 'coordinates': [[[-88.433717, 31.659469], [-88.430242, 31.659505], [-88.430456, 31.657898], [-88.433331, 31.657679], [-88.434876, 31.658665], [-88.433717, 31.659469]]]}}
geojson 
[[[-88.433717, 31.659469], [-88.430242, 31.659505], [-88.430456, 31.657898], [-88.433331, 31.657679], [-88.434876, 31.658665], [-88.433717, 31.659469]]]
tuples 
[(-88.433717, 31.659469), (-88.430242, 31.659505), (-88.430456, 31.657898), (-88.433331, 31.657679), (-88.434876, 31.658665), (-88.433717, 31.659469)]
created
POLYGON ((-88.433717 31.659469, -88.430242 31.659505, -88.430456 31.657898, -88.433331 31.657679, -88.434876 31.658665, -88.433717 31.659469))
action 
created
geojson 
{'type': 'Feature', 'properties': {'style': {'stroke': True, 'color': '#00F', 'weight': 4, 'opacity': 0.5, 'fill': True, 'fillColor': None, 'fillOpacity': 0.2, 'clickable': True}}, 'geometry': {'type': 'Polygon', 'coordinates': [[[-88.432945, 31.6564], [-88.430113, 31.656181], [-88.432001, 31.654683], [-88.432945, 31.6564]]]}}
geojson 
[[[-88.432945, 31.6564], [-88.430113, 31.656181], [-88.432001, 31.654683], [-88.432945, 31.6564]]]
tuples 
[(-88.432945, 31.6564), (-88.430113, 31.656181), (-88.432001, 31.654683), (-88.432945, 31.6564)]
created
POLYGON ((-88.432945 31.6564, -88.430113 31.656181, -88.432001 31.654683, -88.432945 31.6564))
exists GDF2

In the next cell, I printed out gdf2 - I'm trying to add both shapes to this geodataframe. but when I run "print(gdf2)" I get only 1 entry:

geometry
0  POLYGON ((-88.43372 31.65947, -88.43024 31.65950, -88.43046 31.65790, -88.43333 31.65768, -88.43488 31.65866, -88.43372 31.65947))

which does not appear to match the printed out coordinates in output. What am I doing wrong?