Hi ritagoncalves
I'm sorry for this lateness as somehow I missed this topic.
You can remove that in stock info via the file: /templates/gk_box/html/com_virtuemart/productdetails/default.php
At approx line 222, comment or remove this line of code:
<?php echo JText::_('TPL_GK_LANG_IN_STOCK') . ' ' . ($this->product->product_in_stock - $this->product->product_ordered); ?>
Like this: https://prnt.sc/sa2671