Label should not disappear when text is entered, it should be lifted up. You need to add mdbInput directive to the input element to activate this option or use placeholder instead of label if you want the default text to disappear.

<div class="md-form">
  <input mdbInput id="eventTitle" type="text" class="form-control">
  <label for="eventTitle">Event Title</label>
</div>

or

<div class="md-form">
  <input id="eventTitle" type="text" class="form-control" placeholder="Test">
</div>