Day 2 Exercise Level3 : why I have two most frequent words

Hellow, Thank you for the work you've done. I don't know whether I am not sure whether I complete the task 3 in the level3 of the exercise which finding the most frequent word with given the sentence.

/*3.
Clean the following text and find the most frequent word :
(hint, use replace and regular expressions).
 */
const sentence = '%I $am@% a %tea@cher%, &and& I lo%#ve %te@a@ching%;. The@re $is no@th@ing; &as& mo@re rewarding as educa@ting &and& @emp%o@weri@ng peo@ple. ;I found tea@ching m%o@re interesting tha@n any ot#her %jo@bs. %Do@es thi%s mo@tiv#ate yo@u to be a tea@cher!? %Th#is 30#Days&OfJavaScript &is al@so $the $resu@lt of &love& of tea&ching';
// Regex of symbol
let symbolPattern = /\W/gi;
replacement = sentence.replace(/ /gi, 'SYMBOL');
replacement = replacement.replace(symbolPattern, '');
replacement = replacement.replace(/SYMBOL/gi, ' ');
console.log("task3. regex X replace: \n", replacement);
let words   = replacement.split(' ');
let frequency = {};
let maxFrequency = 0;
let mostFrequentWord = '';
console.log(words);
for (let i=0; i < words.length; i++){
    // case insensitive matching
    //let word = words[i].toLowerCase();
    let word = words[i];
    if (frequency[word]){
        frequency[word] += 1; 
    } else {
        frequency[word] = 1;
    }
    if (frequency[word] > maxFrequency) {
        mostFrequentWord = word;
        maxFrequency     = frequency[word];
    }

}
console.log(frequency)
console.log(maxFrequency,mostFrequentWord );

output :

task3. regex X replace:
 I am a teacher and I love teaching There is nothing as more rewarding as educating and empowering people I found teaching more interesting than any other jobs Does this motivate you to be a teacher This 30DaysOfJavaScript is also the result of love of teaching
[
  'I',         'am',                 'a',
  'teacher',   'and',                'I',
  'love',      'teaching',           'There',
  'is',        'nothing',            'as',
  'more',      'rewarding',          'as',
  'educating', 'and',                'empowering',
  'people',    'I',                  'found',
  'teaching',  'more',               'interesting',
  'than',      'any',                'other',
  'jobs',      'Does',               'this',
  'motivate',  'you',                'to',
  'be',        'a',                  'teacher',
  'This',      '30DaysOfJavaScript', 'is',
  'also',      'the',                'result',
  'of',        'love',               'of',
  'teaching'
]
{
  I: 3,
  am: 1,
  a: 2,
  teacher: 2,
  and: 2,
  love: 2,
  teaching: 3,
  There: 1,
  is: 2,
  nothing: 1,
  as: 2,
  more: 2,
  rewarding: 1,
  educating: 1,
  empowering: 1,
  people: 1,
  found: 1,
  interesting: 1,
  than: 1,
  any: 1,
  other: 1,
  jobs: 1,
  Does: 1,
  this: 1,
  motivate: 1,
  you: 1,
  to: 1,
  be: 1,
  This: 1,
  '30DaysOfJavaScript': 1,
  also: 1,
  the: 1,
  result: 1,
  of: 2
}
3 I

It's a bit confusing with the result : the count of 'teaching' is also 3.