Goal for order complete site stopped working

Dear all.
Maybe it is a very simple explanation to my question but it is very strange for me.
I have a WordPress site with woocommerce e-store. I’ ve been using Exact metric plugin for GA till now and additional plugin for GA e-commerce. The idea was to cancel all those plugins and a FB plugin and switch to GoogleTagManager.
I manualy inserted GTM snippsets to my site and adjust the GTM universal analytics and FB pixel…and everything worked great.
Then I installed the plugin GTM for WordPress to integrate the GA E-commerce features.
I thought that all is OK, because the e-commerce tracking worked like a charm but then I realized that I have a problem.
I also have a goals in GA. One of them is tracking my order complete page visits. This goal was working OK until now. After I set an event and tag for e-commerce, the goal for “thank you page/order complete” is not tracking my order complete page anymore. All the other goals are still working OK.
What could be the problem?

Thank you for your answers..

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