I copied the code from your website. This is the URL https://mdbootstrap.com/docs/jquery/components/dropdowns/ and bellow is the code

<div class="btn-group">

<!-- Basic dropdown -->
<button class="btn btn-primary dropdown-toggle mr-4" type="button" data-toggle="dropdown" aria-haspopup="true"
aria-expanded="false">Basic dropdown</button>

<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
<!-- Basic dropdown -->

<!--Dropdown primary-->
<div class="dropdown">

<!--Trigger-->
<button class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="false">Material dropdown</button>


<!--Menu-->
<div class="dropdown-menu dropdown-primary">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</div>
<!--/Dropdown primary-->
</div>

As the code is in the site, the Material dropdown  button does not drop down or show the list that should be dropping once you click. The Basic one does work. I had to remove the class="dropdown" that is  after line 16  <!--Dropdown primary--> to make the dropdown to work BUT it behave just like the plain Bootstrap. I have been trying to contact you guys with no response. We bought this to use BS with material look but this is not working