Strange data sorting and DataTable data entry

I recently added a KeyTable extension for datatable to navigate my table with arrows.

First, I added the following code to select the first record of my table:

gruposDispTab.cell(':eq(0)').focus(); 

      

        
        
        
      

    

But I choose the last entry:

Then, when adding the KeyTable function, the up arrow key selects the bottom row and the down arrow key selects the top row; even so my table's inner scroll works fine (up arrow - scroll up, arrow down, scroll down).

I don't know what datatable config I need to change to fix this.

PD: If necessary, this is what I initialized my datatable:

gruposDispTab = $('#gruposSelect').DataTable({
    //deferRender: true,
    scrollY: 215,
    scrollX: false,
    scrollCollapse: true,
    scroller: true,
    dom: 't',
    sScrollInner: 702,
    bPaginate: false,
    info: false,
    "destroy": true,
    "keys": true,
    searching: true,
    //orderCellsTop: true,
    "language": {
        "search": "Buscar: ",
        "zeroRecords": "No se encontraron coincidencias",
        "info": "Mostrando página _PAGE_ de _PAGES_"
    }
});