Asset url not loading on page

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I have my website customize extensively.

URL attached link to my site & the problem I'm encoutering.
image.pngFormat of graphic loaded on page

As shown on the image above. Initially is suppose to load in this manner. But after the page is loaded, browsing through the options available. The images are gone aren't displayed. My codes are totally detached .
Attached my code below & the directory where my images are uploaded

div#pplr-2160258089063.product-personalizer.pplr_background div.pplr-wrapper.pplr-casing-fan span[ class^="pplr-drop-item _pplr_aigo_dr12_pro_3_pack"] {
  background: url({{ 'aigo_DR12_Pro_3_pack_L1.png' | asset_url}});
  background-position: center;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  @include media-query($small){
	background: url({{ 'aigo_DR12_Pro_3_pack_mobile_l1.png' | asset_url}});


Codes.JPGasset url code not working
Any suggestion to make it work again?
Appreciate your help.