Joshua sent men from Jericho to Ai, which is beside Beth Aven, on the east side of Bethel, and spoke to them, saying, Go up and spy out the land. The men went up and spied out Ai.
To us, this "problem" is too remote chronologically to be of any great concern to Christians.  All studies in the O.T. are perplexed by the names of places that have been changed, and re-changed, one or more times, and by many conflicting opinions about where this or that "place" was located. This is especially observable in a study of those forty-two places where Israel encamped during the forty years in the wilderness.  Some of the questions pertaining to that far-off period are, at the very best, answerable only by conjectural solutions.  The question here is certainty of that nature.