Yes I think it something that came with the last update.
You can comment it out in product/show_block_dimensions.php accessed by the Display/Views menu.
It starts at about line 12
<!-- <span id="hikashop_product_weight_main" class="hikashop_product_weight_main">
<?php echo JText::_('PRODUCT_WEIGHT').': '.rtrim(rtrim($this->element->product_weight,'0'),',.').' '.JText::_($this->element->product_weight_unit); ?><br />
</span>-->
<br/>
After the end span and the end comment you have to add a <br/> to get the layout proper. You see that we commented out that before the end span tag.
Jan