Adding "search on ITAD" to right click menu?

Yes, it is indeed a conflict with another script(s). Those strings are BTA, WL, ... But it is also because I wasn't careful with the code and selected all the children('a') >_<
I have looked around and saw this script by mahermen that adds info from ITAD inside each giveaway page, so I borrowed a pair of functions from him to save you a click when searching the game (you go directly to the ITAD game page, not the ITAD search page). Also this version shouldn't conflict with the rest of your mods scripts (now I only select children('a:first-child')).

// ==UserScript==
// @name        Steamgifts - ITAD links
// @description Adds an icon next to each giveaway that links to its ITAD page
// @include     https://www.steamgifts.com/
// @include     https://www.steamgifts.com/giveaways/*
// @version     0.2
// @grant       none
// ==/UserScript==

//Functions by mahermen
var staticReplacements = {
  "storiesofbethemfullmoon":"storiesofbethemfullmoonedition",
  "feariireborndlc":"feariireborn",
  "justcauseiiixl":"justcauseiiixledition"
};

function romanize(num) {
    var key = ["","i","ii","iii","iv","v","vi","vii","viii","ix"];
    return key[parseInt(num)];
}

function encodeName(str){
    str = str.toLowerCase(); //lowercase
    str = str.replace(/[1-9]/g, romanize);//romanize digits
    str = str.replace(/(^the[^a-z])|([^a-z]the[^a-z])|([^a-z]the$)/g, ""); //remove "the", but not e.g. "other" or "them"
    str = str.replace(/\+/g, "plus");    //spell out "plus"
    str = str.replace(/\&/g, "and");    //spell out "and"
    str = str.replace(/[^a-z0]/g, '');    //remove remaining invalid characters, like spaces, braces, hyphens etc
    return staticReplacements[str] || str;
}

//Main
$('.giveaway__heading').each(function(){
    var gameName = $(this).children('a:first-child').attr('href').split('/')[3];
    var itadDiv = '<a class="giveaway__icon" rel="nofollow" target="_blank" href="https://isthereanydeal.com/#/page:game/info?plain='+encodeName(gameName)+'"><i class="fa fa-fw fa-eur"></i></a>';
    $(this).append(itadDiv);
});

Rarely this can fail due to special URIs given to the games, in that case you can add an exception in staticReplacements var, and report it to mahermen in his thread.

View attached image.