(1.6) Facebook pixel adding more symbols to conted id (Google tag manager)

[pattyo1]

Hello guys, im trying to figure out this problem for almost week i tried almost everything but i have no idea where the problem is. Im trying to create dynamic ads on facebook. I added everything to Google tag manager but viewcontent is not working properly. As u can see on pictures the beggining of content id is right but next symbols dont make any sense. Does have anybody some solution for this?
Code in GTM looks like this
<script>
fbq('track', 'ViewContent', {
  content_ids: [id_product_fb],
  content_type: 'product',
  value: {{dlv.ecomm_totalvalue}},
  currency: 'EUR'
});
</script>

I tried also id_product or many others options but it is still same. I will really appreciate any help. Thank you

[pattyo1]

So i found out it is because of combinations of products. But still dont know how to figure out.