On change delete everything in array and add new values in it

This question already has an answer here:

How do I empty an array in JavaScript? 18 answers

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You need to clear array before pushing new value. Easy way to remove all exisiting values is to set length to 0 :

saveSelectedValue : function (e) {
    var that = e.data.that,
    selectArray = that.filterSelectedCategories;
    selectArray.length = 0; // clear selectArray array
    selectArray.push($('.posts-filter-cat').val());
    console.log(selectArray);
},

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