This is jumblesOrdered: [act, aprt, art, dgo, fgor, opst]

This is jumbles: [arpt, atc, atr, gdo, grof, otsp]

This is jumbleWordHM: {opst=otsp, art=atr, fgor=grof, dgo=gdo, aprt=atc, act=arpt}

for (int i = 0; i < jumblesOrdered.size(); i++) {
        String word = jumbles.get(i);
        String sortedWord = jumblesOrdered.get(i);

        if (jumbleWordHM.get(sortedWord) == null) {
            jumbleWordHM.put(sortedWord, word);
        } else {
            jumbleWordHM.put(sortedWord, jumbleWordHM.get(sortedWord) + " "
                    + word);
        }

    }

This is jumbleWordHM: {opst=otsp, art=atr, fgor=grof, dgo=gdo, ****aprt=arpt, ****act=atc}