Zen Cart 1.5.7c (upgraded from 1.5.6c)
PHP 7.2
Since the upgrade 9 of 11 orders have resulted in a duplicate order in Zen Cart. No double payment, just duplicate order. I've uninstalled and re-installed the plugin. Logging is enabled but I'm not seeing anything obvious in the logs. Admittedly, not sure what I'm looking for.
In PayPal, I've verified IPN is set correctly and enabled. The return url is correct and PDT is enabled an correct.
I checked all url's are using www., thinking a redirect might be causing the duplicate orders.
The duplicates are time stamped 6-10 seconds apart.
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