These are URLs from Recomended/Complimentary products.
Using these links allows Shopify to collect some data on your visitors behaviour and make better recommendations.
It’s possible to modify your theme to not output these links, say look in your card-product.liquid snippet (or similar) and replace
{{ card_product.url }}
with
{{ card_product.url | split: "?" | first }}
This is the easiest, but you’re loosing “intelligence” in product recommendations.
The following should not work, because
a) neither handle nor canonical_url include any of these parameters
b) SE will not like having and URL and being unable to index it – ie those URL will still be in the list of your URL and consume your crawl budget.
{% if handle contains 'seq=uniform' %}
{% endif %}
{%- if canonical_url="*seq=uniform" -%}
{%- endif -%}
A bit better option is to modify robots.txt, however b) from above will still apply and. Have not tried this myself recently.
I thought the best option is to add rel=“nofollow” to these links (and then also disallow in robots), but then I’ve found out that rel=nofollow is now considered only a hint rather then command by Google now.
Relevant info here: https://www.sammyseo.com/death-of-internal-nofollow-use-js-to-stop-google-crawling/
I guess it’s actually possible to implement the JS “onclick” thing, but it’s theme-dependant.
Like instead of
...
output something like
...