Setting selectModel to below:
selectionModel: { type:"row", mode:"single", column:false, all:false, toggle:false},
Even though toggle is false, it still toggles.
My temporary fix for anyone else with the same issue is below:
rowClick: function(event, ui) {
var sel = that.grid.pqGrid("SelectRow");
if( !sel.isSelected({rowIndx:ui.rowIndx }) )
sel.add({rowIndx:ui.rowIndx});
},