I’ve dealt with this exact. same. issue. Today, in fact. Here’s a checklist to make sure GA & Ads are passing audience info back and forth:

* In Ads, check in Audiences – Audience sources and make sure you have connections for both Google Ads and GA (UA). (Also check for any errors here.)
* In GA, I’m sure you have the Ads account linked under Property Settings – Google Ads, but check under Tracking Info – Tracking Code and make sure the correct Ads tag is populated under Connected Site Tags – it doesn’t always transfer / get detected thru Shopify.
* Make sure to also check under Audience Definitions – Audiences and see if you’ve got audiences properly defined, and if any are connected to both Ads & GA.

We also cleaned up some additional superfluous tracking code that was still hanging around from previous installations / connections that seemed to be causing conflicts.

As an aside, you didn’t specifically mention if it was *Smart* Shopping campaigns that you were running, but if so, keep in mind Smart Shopping ads use dynamic retargeting already, and will likely drown out any display campaigns you’d run concurrently.

EDIT: I’m assuming your call for assistance was towards a colloquial “guys”. 🙂