Getting "double" output -- Java HashMap

This is a spinoff of this question. I am using a HashMap to convert numbers 0-9 in a String to their text equivalent.

I am using this code to accomplish this:

public String ConvertSentance(String s){
    sb = new StringBuilder(s);

    h.put("0","zero");
    h.put("1","one");
    h.put("2", "two");
    h.put("3", "three");
    h.put("4", "four");
    h.put("5", "five");
    h.put("6", "six");
    h.put("7", "seven");
    h.put("8", "eight");
    h.put("9", "nine");

    String[] split = s.split(" ");

    for (String newS : split) {
        if (h.containsKey(newS)) {
            sb.append(h.get(newS));
            sb.append(' ');
        }
        else {
            sb.append(newS);
            sb.append(' ');
        }
    }

    convertedSent = sb.toString();
    return sb.toString();

}

/**
 * @return Returns the converted String
 */
public String getConvertedS(){
    return convertedSent;
}  

Output

Getting this:

The 8 eggs were separated into 3 groups.The eight eggs were separated into three groups.

When the output should be this:

The eight eggs were separated into three groups.

Any ideas how I can correct this? I have tried removing different things with no luck.

Here is the code for the full project.