VAT text at cart order, order review and other templates not correct

Hi everyone,

I have an slightly an issue with the ′VAT text′. I hope I can fix this with an add_filter in functions.php, because all templates are affective,

I am running version 3.4.3 of WooCommerce. WordPress is version 4.9.7.
All plugins are updated to the latest versions.
The installed language (WordPress en WooCommerce) is Dutch by default, but the VAT (BTW) not correct. I′ve already checked the .po files, everything is fine.

Screenshot (not correct)- ISSUE

View post on imgur.com

Text (correct): Inclusive BTW 21% eurosign price

Piece of the code:

<h3 class="heading-1">Winkelwagen-totalen</h3>
			
<div class="cart_totals overlay_bg pd20 mgb40 ">

	
	<table cellspacing="0">

		<tr class="cart-subtotal">
			<th>Subtotaal</th>
			<td><span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">&euro;</span>18.00</span></td>
		</tr>

		
		
			
			<tr class="shipping">
	<th class="heading-color">Verzending</th>
	<td data-title="Verzending" colspan="2">
					Binnen Nederland: <span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">&euro;</span>6.95</span> <input type="hidden" name="shipping_method[0]" data-index="0" id="shipping_method_0" value="flat_rate:1" class="shipping_method" />		
		
								</td>
</tr>

			
		
		
				
		<tr class="order-total">
			<th>Totaal</th>
			<td><strong><span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">&euro;</span>24.95</span></strong> <small class="includes_tax">(inclusief <span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">&euro;</span>3.12</span> 21%)</small></td>
		</tr>

		
	</table>

Can someone help me out?
For testing purpose, I have migrate the website to an test environment. so I can adjust the code, without harming the live/public website.

Sincerley,
Bas