Just to update you on the problem. Again am not too sure if its because of the plugin or something at my end. However this is only happening after activating your plugin.
1. Once I delete my browser cache, the site (presser.co) opens up fine.
2. However, after a few clicks within the website, I again start to get 404.
3. My observation is that whenever my website is leaving cookies in the browser, its showing 404!
And now I am getting warning from Google Search Console complaining of 404 errors on urls.
Please look into it on priority.
Regards,
Amit