Photos will definitely help. Unfortunately, from the written description, your setup is not secure, as evidenced by the incursions. Is the enclosure covered or open topped? Most welded wire has openings that eont exclude predators and poultry netting (chicken wire) lacks the ability to exclude anything.....if that is combined with an open top on the enclosure pretty much every predator of poultry can make entry one way or another with relatively little effort.
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