remove all before problems

Not sure where some of the "correct answers" came from on this exercise

def remove_all_before(items: list, border: int) -> Iterable:
    new_list = []
    for x in items:
        if border not in items:
            new_list = items
        elif not items:
            return items
        elif items.index(x) >= items.index(border):
            new_list.append(x)
    return new_list


if __name__ == '__main__':
    # print("Example:")
    # print(list(remove_all_before([1, 2, 3, 4, 5], 3)))

    # These "asserts" are used for self-checking and not for an auto-testing
    assert list(remove_all_before([1, 2, 3, 4, 5], 3)) == [3, 4, 5]
    assert list(remove_all_before([1, 1, 2, 2, 3, 3], 2)) == [2, 2, 3, 3]
    assert list(remove_all_before([1, 1, 2, 4, 2, 3, 4], 2)) == [2, 4, 2, 3, 4]
    assert list(remove_all_before([1, 1, 5, 6, 7], 2)) == [1, 1, 5, 6, 7]
    assert list(remove_all_before([], 0)) == []
    assert list(remove_all_before([7, 7, 7, 7, 7, 7, 7, 7, 7], 7)) == [7, 7, 7, 7, 7, 7, 7, 7, 7]
    print("Coding complete? Click 'Check' to earn cool rewards!")

the messages I get when checking are Your result:[5,6,7] Right result:[5,6,7,10] Fail:removeallbefore([10,1,5,6,7,10],5)