What version of the plugin are you using?
There is a recent issue that just started occurring on 7/10/19:
https://ww.wp.xz.cn/support/topic/ecommerce-tracking-stopepd-on-1-4-10
Downgrade to 1.4.9 if you are no longer seeing the transaction / total sales numbers working properly (or campaign ROAS).
We do not have the “Enable Standard Tracking” config checkbox checked, and the changes in 1.4.10 disable a bit of code when this config option is not checked.
In other words, we can also confirm that one of our sites that upgraded to 1.4.10 on Friday was no longer capturing transaction numbers or order totals properly. One two days in a row it only captured 1-2 orders total!