The implication and symbol of a large number of flies entering the house

The appearance of flies at home first means that the hygiene at home may not be particularly good, or there is a smell that attracts flies to run home, indicating that you need to clean up the hygiene at home. In geomantic omen, if you clean up your home, geomantic omen will naturally be fine. Because from the perspective of geomantic omen, the god of wealth likes a home with bright and clean windows. During the Spring Festival, we have the custom of offering sacrifices to our ancestors. Usually we burn some paper money at home to pay homage to our ancestors. But the year before last, when my mother was worshipping her ancestors, suddenly a group of flies flew into the house, and then she was worshipping my father's ancestors. Later, when she was worshipping my Mazu, she flew into a swarm of bees! Now think about it, I don't know what to ask. It stands to reason that there are not so many flies and bees in winter, but they just appear suddenly for no reason and fly in batches!