It is usually that Location Allocation model would link the nearest facilities to the nearest demand points. However, In my project, most of the demand points are serviced by the nearest facilities except about 11 points. I tried both Arcgis and Arcgis Pro both gave me the same results. In addition, when I use another facility layer the problematic points number change, I think its related to the location of the facilities as the demand points are fixed.
Could anyone please give any thought why this happened, even though, I used 4 type of network layers to reassure that no problem with network itself?