Magento – Magento Enhanced Ecommerce Google Analytics Implementation

In my opinion you would need to put paypal.com on the exclusion list and then it should work as usual again. I have had the same experience but this should be explained in the following links, just have a quick read through.

Link 1: https://productforums.google.com/forum/#!topic/analytics/vpEQwRHE-1w

Link 2: https://support.google.com/analytics/answer/2795830?hl=en&ref_topic=2790009

Hope that helps

Got it , it was a conflict with payment method module (klarna 5.2) which override block/ga.php. just some xml configuration solve the problem or upgrade to klarna 5.3. Now it's working!