Currently the dataLayer variable in the head does not take into account that the same variable could be inserted by other module above this script tag. Therefore the inserted is overriden by the datalayer module version of the variable. Instead, it should be merged, not overriden.
Also, GTM docs recommend all the the datalayer stuff should be inserted in the page above the GTM snippet but for now this tag
<script type="text/javascript" src="http://drugan.ee/sites/all/modules/datalayer/datalayer.js?p5kjs3"></script>
is inserted in the middle of other scripts. The issue is that the google_tag module inserts its GTM snippet at the very top of other tags. So, the datalayer tag becomes below it, which is actually wrong.
Fixed
1.0
Code
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Issue #2953023 by drugan, ckng, angrytoast, blake.thompson: Change the...
Automatically closed - issue fixed for 2 weeks with no activity.