the redis stream length limit not work when using python redis

Now I am using python(Python 3) redis client to add element into redis stream, this is the dependencies of the lib:

redis~=5.0.3

and then this is my code to write element into redis using Python:

def push_message_to_stream(article):
    try:
        message = {
            "id": article.id,
            "sub_source_id": article.sub_source_id
        }
        #
        # Redis did not remove the ack message automatic
        # when the element is full, it remove the oldest
        #
        redis_client.xadd(name=article_stream_name, fields=message, maxlen=10)
        # redis_client.xgroup_create(name=article_stream_name, groupname=article_group_name)
        # redis_client.publish(channel=article_stream_name, message="hello world!")
    except Exception as e:
        logger.error("write stream error:", e)

the element could write into redis successfully, but after I add parameter of maxlen to 10, when I check the stream element in redis, it still has more than 90+ element in the stream, I gusses maybe the redis using old creator config,then I tried delete the stream and recreated it but still in this situation, where am I doing wrong? why the maxlen parameter did not take any effect?