Return messages for 2 vessels from a list fo 15

[StHermes]

Hi, i created a list with MMSI numbers and the code below:
async def connect_ais_stream():

ship_columns1 = ['Last Update', 'Ship ID', 'Latitude', 'Longitude', 'TrueHeading']
ship_columns2 = ['Last Update', 'Ship ID','Name', 'Dest.', 'ETA',]
ship_dataframe1 = pd.DataFrame(columns = ship_columns1)
ship_dataframe2 = pd.DataFrame(columns = ship_columns2)
running_list1 = []
running_list2 = []
ship_list = [240848000,636020291,241387000,241409000,636021702,241410000,240849000,241389000,241388000,241107000,636020889,240901000]
# Use a for loop to create a new connection every time the previous one is closed
for _ in range(10): # You can change the number of attempts here
    try:
        async with websockets.connect("wss://stream.aisstream.io/v0/stream", ping_interval=None) as websocket: # Disable the ping interval here
            subscribe_message = {"APIKey": "ed151fd1e624bf331d94d6411e73cbeea72b7d35", "BoundingBoxes": [[[-90, -180], [90, 180]]]}

            subscribe_message_json = json.dumps(subscribe_message)
            await websocket.send(subscribe_message_json)
           
           

            async for message_json in websocket:
                message = json.loads(message_json)
                message_type = message["MessageType"]
               

                if message_type == "PositionReport":
                    # the message parameter contains a key of the message type which contains the message itself
                    ais_message = message['Message']['PositionReport']
                    ShipId =  int(ais_message['UserID'])
                    
                    if ShipId in ship_list:
                        #running_list = ["none", "none","none", "none","none", "none","none", "none"]
                    #print(f"[{datetime.now(timezone.utc)}] ShipId: {ais_message['UserID']} Latitude: {ais_message['Latitude']} Longitude: {ais_message['Longitude']} Heading: {ais_message['TrueHeading']}")
                        running_list1.append(datetime.now().strftime('%d-%m-%Y %H:%M:%S'))
                        running_list1.append(int(ais_message['UserID']))
                        running_list1.append(ais_message['Latitude'])
                        running_list1.append(ais_message['Longitude'])
                        running_list1.append(ais_message['TrueHeading'])
                        
                        ship_dataframe1.loc[len(ship_dataframe1)] = running_list1
                       # ship_dataframe1 = ship_dataframe1.drop_duplicates(subset=['Ship ID'], keep="last")
                        ship_dataframe1.to_pickle("ship_dataframe1.pkl")
                        running_list1 = []
                        print(ship_dataframe1) 

and i constantly receive data for only 2 vessels out of 12