You are definitely on the right path with the other plugin being the culprit. I was able to isolate the problem to my WooZone Amazon Associates plugin after disabling and re-enabling all of my plugins one at a time. I’ve reached out to the WooZone support team who have apparently released an update fixing this bug. I would definitely consider reaching out to the Amazon eStore plugin support team to see if they have fixed the bug themselves.
I hope you get it resolved soon ??